He won the Danish Cup with AGF Aarhus and played in England for top level teams Ipswich Town and Everton, as well as Wolfsburg in Germany.
He played 20 matches for the Danish national team, and represented Denmark at the 1992 Summer Olympics and 1996 European Championship.
[6] He was injured in an under-21 national game against Poland in March 1992, but recovered in time to help AGF win the 1992 Danish Cup.
Thomsen was also called up to the Danish national squad for the 1996 European Championship, and played in all of Denmark's three matches before elimination.
[9] After little more than a year at Everton, marred by poor performances, he moved back to Denmark for £500,000 in March 1998, to play for Akademisk Boldklub[1] (AB).