Joos Valgaeren (Dutch pronunciation: [ˈjoːs fɑlˈɣaːrə(n)];[a] born 3 March 1976) is a Belgian former international professional footballer who played as a defender.
His most successful spell was his time at Celtic, where he won three league titles and was part of the side that reached the 2003 UEFA Cup final.
Born and raised in Leuven, Joos Valgaeren started his career at amateur side Serskamp in his home town.
During O'Neill's first three years at Celtic, Valgaeren was first choice in a three-man defence consisting of himself, Johan Mjällby and Bobo Baldé.
After an outstanding club season in 1999–2000, he was named in Robert Waseige's 23-man squad for the 2000 European Football Championships and played in all three group games.