||This biographical article needs additional citations for verification. (February 2013)|
|Full name||Nicolaas Pieter Claesen|
|Date of birth||1 October 1962|
|Place of birth||Maasmechelen, Belgium|
|Height||1.71 m (5 ft 7 1⁄2 in)|
|RFC Liège (manager)|
|1977–1978||K. Patro Eisden Maasmechelen|
|1985–1986||Standard de Liège||28||(10)|
|1988–1992||Royal Antwerp FC||119||(39)|
|1993–1994||Royal Antwerp FC||31||(2)|
|2005–2008||Patro Eisden MM|
|* Senior club appearances and goals counted for the domestic league only.
† Appearances (Goals).
Among the many club teams he played for were Tottenham Hotspur, who bought him from Standard Liege in 1986–87 for £600K and sold him for £550K to Antwerp FC in August 1988. He also played for VfB Stuttgart.
He earned 36 caps and scored 12 goals from 1983 to 1990 for the Belgium national football team, and was in the squad for three major tournaments: UEFA Euro 1984, the 1986 FIFA World Cup, where he scored three goals as Belgium finished in fourth, and the 1990 FIFA World Cup.