Managed by Co Adriaanse, Willem II finished in fifth place in the 1997–98 Eredivisie, thereby securing qualification for the 1998–99 UEFA Cup.
[1] In the UEFA Cup's first round the club knocked out Georgian side Dinamo Tbilisi with two 3–0 wins.
[1] Willem II exited the competition in the second round, following a 1–1 draw and a 3–0 defeat against Spanish club Real Betis.
[1] In the 1998–99 KNVB Cup Willem II were knocked out in the first round by FC Zwolle with Geoffrey Prommayon scoring an own-goal in a game that finished 2–0.
[1] Note: Flags indicate national team as defined under FIFA eligibility rules; some limited exceptions apply.