|Full name||Marcel Keizer|
|Date of birth||15 January 1969|
|Place of birth||Badhoevedorp, Netherlands|
|Height||1.82 m (6 ft 0 in)|
|* Senior club appearances and goals counted for the domestic league only|
He was technical coach of Eerste Divisie side FC Emmen. He was also the coach of Telstar for two seasons and took the reins at SC Cambuur in February 2016. In June 2016, he left Cambuur and became coach of Jong Ajax.
On 17 June 2017, Keizer became the new coach of Ajax on a two-year contract, after managing the youth side in the previous season, thus replacing the Borussia Dortmund-bound Peter Bosz. After 17 games Ajax was second in the Eredivisie ranking with five points behind the leader PSV, and Keizer was fired on 21 December 2017, after losing a cup match by penalties against FC Twente.
He received his first foreign job on 2 June 2018, replacing retired compatriot Henk ten Cate at Al Jazira Club of the UAE Pro-League. On 8 November the same year, he was allowed to resign to take the job at Sporting CP, with his club unbeaten and in second place at the time.
Keizer signed for the Lisbon-based club on a contract until 2021. On his debut on 24 November they won 4–1 at Lusitano FCV in the fourth round of the Taça de Portugal, and in his first Primeira Liga match on 3 December, the club won 3–1 at Rio Ave. Sporting completed a cup double in Keizer's first season, seizing both the Taça da Liga and Taça de Portugal in penalty shootout wins against FC Porto. He was the first foreign manager to win the latter tournament since compatriot Co Adriaanse of Porto in 2006. He left Sporting on 3 September 2019.
- As of match played 31 August 2019
|Telstar||1 July 2012||1 May 2014||71||21||15||35||29.58|
|FC Emmen||1 July 2015||14 February 2016||26||12||4||10||46.15|
|SC Cambuur||15 February 2016||2 June 2016||11||1||2||8||9.09|
|Jong Ajax||2 June 2016||17 June 2017||38||23||7||8||60.53|
|Ajax||17 June 2017||21 December 2017||24||14||5||5||58.33|
|Al Jazira||2 June 2018||9 November 2018||13||7||5||1||53.85|
|Sporting CP||12 November 2018||3 September 2019||42||25||9||8||59.52|
- Netherlands - M. Keizer - Profile with news, career statistics and history Soccerway
- Cambuur strikt Keizer als hoofdtrainer - AD (in Dutch)
- Marcel Keizer Worldfootball.net
- "Officieel: Marcel Keizer nieuwe hoofdtrainer Ajax". NOS. 17 June 2017. Retrieved 10 August 2017.
- Ajax stelt Marcel Keizer, Hennie Spijkerman en Dennis Bergkamp op non-actief
- "Al Jazira Appoints Marcel Keizer as New Coach". Al Jazira Club. 2 June 2018. Retrieved 29 July 2019.
- "Keizer to step down as Coach, Damien Hertog to take lead". Al Jazira Club. 8 November 2018. Retrieved 29 July 2019.
- "Oficial: Sporting confirma Marcel Keizer como treinador até 2021" [Official: Sporting confirm Marcel Keizer as manager until 2021]. Diário de Notícias (in Portuguese). 8 November 2018. Retrieved 29 July 2019.
- "Marcel Keizer: «Foi um bom dia para nós»" [Marcel Keizer: "It was a good day for us"]. Record (in Portuguese). 24 November 2018. Retrieved 29 July 2019.
- "COMENTÁRIO: Sporting bate Rio Ave na estreia de Marcel Keizer no campeonato" [COMMENTARY: Sporting beat Rio Ave on Marcel Keizer's championship debut]. Diário de Notícias (in Portuguese). 3 December 2018. Retrieved 29 July 2019.
- "Penalties smile on Sporting again as Lions retain Taça da Liga crown". PortuGOAL.net. 26 January 2019. Retrieved 27 January 2018.
- "Sporting Lisbon take Portuguese Cup on penalties after epic final". Be Soccer. 26 May 2019. Retrieved 29 July 2019.
- "Keizer looft 'indrukwekkende mentaliteit' na 'epische dag'" [Keizer praises 'impressive mentality' after 'epic day'] (in Dutch). Voetbal International. 25 May 2019. Retrieved 8 August 2019.
- "Marcel Keizer já rescindiu com o Sporting" [Kaizer already rescinded with Sporting]. A Bola (in Portuguese). 3 September 2019. Retrieved 3 September 2019.