The knockout stage of the 1998–99 UEFA Champions League began on 3 March 1999 and ended with the final at the Camp Nou in Barcelona on 26 May 1999. The eight teams from each of the six groups in the group stage competed in the knockout stage. For the quarter-finals, each group winner was randomly drawn against the runner-up from another group. The four quarter-final winners were then drawn together for the semi-finals, the winners of which contested the final.