Monaco, Porto, Roma, Villarreal and Ajax are among those to feature as UEFA.com recalls the UEFA Champions League's biggest upsets from the knockout phase.

In one of the most disappointing nights in the recent history of the club, AC Milan were knocked out by Feyenoord in the playoffs of the UEFA Champions League. After losing 1-0 during the first leg in Rotterdam,

AC Milan was to left rue Theo Hernandez’ sending off for diving as Feyenoord progressed to the Champions League last 16 at the former European champion’s expense with a 1-1 draw in the second leg of t