The Argentinian was initially expected to be sidelined for just six months with a damaged ligament, but surgery to correct the problem revealed a complete tear. The defender picked up the injury in Barca´s Champions League semi-final second-leg defeat against Manchester United last month.
Surgeon Ramon Cugat told a news conference: "First we carried out arthroscopic surgery on the right knee and discovered that effectively the ligament was broken, so we proceeded to extract tendon from the left knee to incorporate it into the damaged one.
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