Ahead of the new season, César changed his squad number from 12 to 1, which was vacated by the retired Francesco Toldo. His old squad number became part of newcomer Luca Castellazzi. On 21 August 2010, he won his 4th Supercoppa Italiana trophy; Inter faced Roma in a 3–1 comeback win at San Siro. In November 2010, the medical staff discovered a torn thigh injury at Júlio César and put his presence at FIFA Club World Cup in doubt. He was recovered in time and was called for the tournament, keeping a clean-sheet in the semi-final match against Seongnam Ilhwa Chunma. He kept his goal intact in the final as well which helped the team to win the trophy for the first time after defeating TP Mazembe 3–0. Inter thus completed the Quintuple to become the fourth team in the world after Liverpool in 2001, Al-Ahly in 2006 and Barcelona in 2009. Júlio César ended 2010 by being named second best goalkeeper of 2010 by IFFHS, only behind Iker Casillas. He was also named Inter Player of the Year for 2010 for his outstanding appearances throughout the year, receiving Pirata d'Oro Award. He finished 19th in the 2010 FIFA Ballon d'Or ranking, winning two places compare to last year ranking.