After a further five seasons with Bayer 04 Leverkusen, playing in all 38 league matches with nine goals in the first campaign with teams from the re-unified Germany, Kree moved to Borussia Dortmund, where he won back-to-back league championships, the 1997 Champions League and the Intercontinental Cup, also in that year. During the club's Champions League victorious campaign, he played in eight matches (six complete, including the final).