Born in
Volendam, Keizer played youth football with hometown club
FC Volendam before moving to Dutch giants
Ajax. He never broke into the first team, and moved to
Vitesse, where he made his professional debut in the 2007–08 season. He moved on loan to
FC Zwolle in January 2009, before signing a permanent contract in June 2009. Keizer remained a player of Zwolle for a year and a half, after which he left for
FC Oss. In 2012, he started playing for his youth club
RKAV Volendam. After his retirement in 2017, Cees started his coaching career at RKAV Volendam. There, he coached the U11 team for three consecutive years and later began working as a youth coach for FC Volendam. He became a UEFA A Youth coach in June 2020. ==References==