for the rest of the year. Reserve keeper Zeljko Kalac deputized until Dida returned on 21 January 2007 in a goalless draw with Lazio. He missed 13 total Serie A matches due to recurring knee and shoulder problems, after having missed ten games in the last three seasons combined. Milan additionally had to qualify for the 2006–07 Champions League, accomplished by defeating Red Star Belgrade on aggregate, and the Rossoneri then proceeded to top their group as Dida kept four clean sheets and conceded only twice in that six-match span. In the quarter-finals against Bayern Munich, he was criticized for conceding a stoppage-time equalizer from Daniel Van Buyten in the first leg on 3 April that relegated Milan to a 2–2 home draw. Dida then kept a clean sheet in the second leg as Milan shut out Bayern 2–0 and advanced to the semi-finals against Manchester United, but he again received criticism for errors resulting in goals (from Cristiano Ronaldo and Wayne Rooney) in a 3–2 defeat. After the loss, a Milan fan mockingly put Dida up for sale on auction site eBay before the site removed the listing. Dida kept another second-leg clean sheet in Milan's decisive 3–0 home win on 3 May, in addition to becoming the first goalkeeper to register an assist in the Champions League, as the Rossoneri advanced to the 2007 final for a rematch against Liverpool. Dida saved from Jermaine Pennant, Steven Gerrard and Peter Crouch as Milan won 2–1 and he raised his second Champions League trophy, and the Rossoneri's seventh overall, in five seasons. 2007–08: Injury problems, Celtic fan incident, and benching Dida won his second career UEFA Super Cup after Milan defeated Sevilla on 31 August 2007, and his second FIFA Club World Cup with Milan's 4–2 win over Boca Juniors on 16 December. He had additionally set a record with his sixth match played in the competition, a mark that was broken after several Al Ahly players collectively earned their seventh caps the next year. However, Dida endured his worst season with the club, as ongoing poor form and injuries spelled the end of his tenure as Milan's number one after six seasons, as the Rossoneri finished fifth in Serie A and consequently missed out on Champions League qualification for the following season. On 3 October 2007, during Milan's Champions League group stage match against Celtic in Glasgow, Celtic striker