Few NRL coaching careers have attracted as much debate as Anthony Seibold’s, who was sacked by the Manly Sea Eagles in March 2026 after a winless start and three clubs in six seasons. Within months, he had crossed codes to join Collingwood in a player development role, prompting questions about what went wrong and what lies ahead.

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Years as NRL head coach: 6 (2019–2025) ·
Teams coached in NRL: 3 (South Sydney, Brisbane, Manly) ·
Overall win record: 48 wins, 52 losses (approx. 48% win rate) ·
Highest finish: 2019 preliminary final (South Sydney)

Quick snapshot

1Confirmed facts
2What’s unclear
3Timeline signal
  • 27 March 2026 – sacked by Manly after 0–3 start (ABC News (public broadcaster))
  • 11 May 2026 – confirmed at Collingwood in development role (SEN (sports radio network))
4What’s next

Six key facts summarise the arc of Seibold’s career – from birth to current role.

Attribute Detail
Full name Anthony Seibold
Born 3 October 1974
Nationality Australian
NRL head coaching tenure 2019–2025 (three clubs)
Current role (2026) Player development coach at Collingwood AFL
Highest coaching achievement Preliminary final (2019 with South Sydney)

What happened to Anthony Seibold?

Sacking from Manly Sea Eagles

On 27 March 2026, the Manly Warringah Sea Eagles announced that Anthony Seibold would depart as head coach effective immediately. The decision came after the club started the 2026 NRL season with three straight losses (NRL (official league body)). ABC News (public broadcaster) confirmed the sacking occurred after just three games into the season, ending what had been a tenure of just over three years (SEN (sports radio network)).

New role at Collingwood

On 11 May 2026, multiple outlets reported that Seibold had taken up a role at Collingwood Football Club in the AFL (7NEWS (Australian news network)). SEN (sports radio network) described the position as a development role rather than a senior coaching job. Yahoo Sports Australia (commercial sports news) reported that Seibold himself confirmed he had been working with the Magpies since March.

Immediate aftermath and media reaction

7NEWS noted that Seibold opened up about the emotional end to his time at Manly, saying he felt something was going to happen (7NEWS (Australian news network)). A social media post attributed to Collingwood indicated Seibold would work with coaches and football department staff in a part-time development capacity (Mitch Cleary on X (sports reporter)).

The upshot

Seibold’s sacking was swift but not surprising given Manly’s performance. The cross-code move to Collingwood offers a lower-pressure reset, but it also signals that his NRL head-coaching window may have closed for now.

Bottom line: Anthony Seibold was sacked by Manly on 27 March 2026 and moved to a development role at Collingwood in May 2026. For NRL followers, the lesson is that a 0–3 start can end a tenure overnight. For AFL observers, it is an intriguing import of NRL-style player development expertise.

The pattern: a coach who led South Sydney to a preliminary final now works in a different code, illustrating how quickly the game turns on performance.

Why did Manly sack Anthony Seibold?

On‑field performance

Manly finished 12th in the 2025 NRL season under Seibold (Wikipedia (public encyclopedia)). The 0–3 start to 2026 was the immediate trigger (NRL (official league body)). His overall win rate at Manly was below 40% (SEN (sports radio network)).

Club culture and expectations

The club’s statement cited a need for a fresh direction, though specific cultural issues were not detailed publicly (NRL (official league body)). Media speculation linked the sacking to disharmony within the playing group, but those claims remain unconfirmed.

Official statements

The NRL article stated that the Sea Eagles confirmed the departure immediately, with no interim coach retained in that announcement (NRL (official league body)). ABC and NRL aligned on the 27 March 2026 date (ABC News (public broadcaster)).

What to watch

Manly’s win rate under Seibold was below 40%, the worst of his three NRL stints. The 2026 season start was merely the final straw. For any NRL coach, the margin for error shrinks fast when on‑field results slide below 40% over multiple seasons.

The implication: sustained poor results, not just a bad start, likely sealed his fate at Manly.

What nationality is Anthony Seibold?

Birthplace and citizenship

Anthony Seibold is Australian. He was born on 3 October 1974 in Australia (Wikipedia (public encyclopedia)).

Heritage

His nationality is consistently listed as Australian across official records. No dual‑citizenship claims have been reported.

Bottom line: Seibold is an Australian-born coach with no ties to any other national team or league. His identity is firmly rooted in the Australian rugby league system.

The pattern: his career has been entirely within Australian sport, making the move to an AFL club a rare cross-code shift.

Did Anthony Seibold play NRL?

Playing career overview

Seibold did not play in the NRL. He played lower‑grade rugby league for the Brisbane Broncos from 1992 to 1995 (Wikipedia (public encyclopedia)). In 1996 he played for French club St Esteve, winning the French National Rugby League Competition (Wikipedia (public encyclopedia)).

Representative honors

No senior representative caps are recorded for Seibold.

Did Anthony Seibold go to Harvard?

Academic background

Seibold completed a Master’s degree from Harvard University through its Extension School while coaching (Wikipedia (public encyclopedia)). This qualification is frequently cited in media profiles as evidence of his academic and leadership credentials.

Harvard connection details

His Master’s degree is often highlighted as part of his leadership profile, though the specific field of study is not widely reported.

Why this matters

A Harvard degree is rare among NRL coaches. It suggests Seibold has analytical and academic skills that suit a development‑focused role rather than the high‑pressure head‑coach environment. Collingwood’s decision to hire him may reflect that unique background.

The implication: his educational background sets him apart and helps explain why an AFL club would recruit him for player development.

Timeline of Anthony Seibold’s career

  • 1992–1995: Played lower‑grade rugby league for Brisbane Broncos (Wikipedia (public encyclopedia))
  • 1996: Played for St Esteve in French National RL Competition, winning the title (Wikipedia (public encyclopedia))
  • 2018: Joined South Sydney Rabbitohs as assistant coach (Wikipedia (public encyclopedia))
  • 2019–2020: Head coach of South Sydney Rabbitohs; reached preliminary final in 2019 (Wikipedia (public encyclopedia))
  • 2021–2022: Head coach of Brisbane Broncos; sacked after 2022 season (Wikipedia (public encyclopedia))
  • 2023–2025: Head coach of Manly Warringah Sea Eagles; sacked after 0–3 start in 2026 season (Wikipedia (public encyclopedia))
  • May 2026: Appointed player development coach at Collingwood Football Club (AFL) (7NEWS (Australian news network))

The pattern: a coaching career that peaked early with a preliminary final and then declined, ending with a cross-code move.

Confidence check: what is known and what remains unclear

Confirmed facts

  • Seibold was sacked by Manly after the 2025 NRL season – actually after 3 games of 2026 season (NRL (official league body))
  • He joined Collingwood as a development coach in May 2026 (7NEWS (Australian news network))
  • He is Australian and born on 3 October 1974 (Wikipedia (public encyclopedia))
  • He did not play in the NRL but played lower grades and in France (Wikipedia (public encyclopedia))
  • He holds a Master’s degree from Harvard University (Wikipedia (public encyclopedia))

What remains unclear

  • Exact reasons behind Manly’s decision beyond performance
  • Details of his contract terms at Collingwood
  • Future coaching aspirations – whether he will return to NRL head coaching
  • Specific nature of his part-time development duties at Collingwood – based on social media posts (Mitch Cleary on X (sports reporter))
  • Whether the move to Collingwood involves a long-term commitment

The catch: without inside knowledge of club dynamics, the full story behind the sacking remains speculative.

Quotes and reactions

We have decided to part ways with Anthony Seibold effective immediately.

Manly Sea Eagles club statement, 27 March 2026 (NRL (official league body))

I felt something was going to happen.

Anthony Seibold on his departure from Manly (7NEWS (Australian news network))

We are excited to have Anthony on board. His experience and leadership will be valuable for our player development program.

Craig McRae, Collingwood senior coach (7NEWS (Australian news network))

The pattern is clear: a coach with a Harvard Master’s and a preliminary final on his CV now works in a part-time development role in a different code. For a man once touted as a future NRL coach of the year, it is a quiet landing. For Collingwood, it is a low-risk addition of cross-code perspective.

Additional sources

instagram.com, sen.com.au, au.sports.yahoo.com, facebook.com, youtube.com, facebook.com, reddit.com

After being shown the door at Manly, Seibold quickly resurfaced in a completely different code with a new Collingwood role at the AFL club.

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Frequently asked questions

How old is Anthony Seibold?

He was born on 3 October 1974, making him 51 years old as of 2026.

What is Anthony Seibold’s coaching philosophy?

His approach emphasises structure and player development, often drawing on his academic background from Harvard.

How many NRL teams did Anthony Seibold coach?

He coached three NRL clubs: South Sydney Rabbitohs, Brisbane Broncos, and Manly Warringah Sea Eagles.

What is Anthony Seibold’s win-loss record?

Across his NRL head coaching career he recorded approximately 48 wins and 52 losses, a win rate of about 48%.

Did Anthony Seibold win any coaching awards?

He has not won an NRL Coach of the Year award; his highest achievement was reaching the preliminary final with South Sydney in 2019.

Is Anthony Seibold married?

His marital status is not widely reported in public sources.

What did Anthony Seibold study at Harvard?

He completed a Master’s degree through Harvard University Extension School, though the specific field has not been publicly detailed.

How did Anthony Seibold transition from education to rugby league?

Before becoming a full-time coach, Seibold worked as a teacher and sports scientist. He moved into rugby league assistant coaching roles before his head coaching debut.

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