In June 2009, Materazzi was handed a new deal by Inter until June 2012. He was used sparingly during the 2009–10 season, making 20 appearances in all competitions. In January 2010, he underwent arthroscopic surgery to repair damage to the medial meniscus in his right knee which kept him sidelined for one month. Materazzi was an injury-time substitute for Inter in the 2010 UEFA Champions League Final against Bayern Munich, replacing Diego Milito who scored both of their goals in the 2–0 victory in Madrid. In addition to that, Inter also clinched the "Scudetto", for the fifth season in a row, and Coppa Italia, to complete the Treble.