Roger Claessen was a Belgian footballer who played as a forward. He finished as the top scorer of the Belgian League with 20 goals (along with Paul Van Himst) in 1968 while playing for Standard Liège. He played 17 times with the Belgium national team between 1961 and 1968, scoring seven goals. Claessen made his international debut on 20 May 1961 in a 2–1 defeat to Switzerland, and he scored. Wikipedia