MADRID (Reuters) -- Barcelona captain Carles Puyol will undergo surgery on his troublesome left knee on Wednesday, the Spanish and European champions said.

The 33-year-old defender, who is unavailable for Spain's friendlies against United States and Venezuela next month, missed most of the second half of the season due to injury.

He was left out of the starting 11 for Saturday's 3-1 Champions League final victory over Manchester United but was given a run-out in place of Daniel Alves in the 88th minute.

Doctors Ricard Pruna and Ramon Cugat will brief the media after the operation, Barca said on their website (www.fcbarcelona.cat).

SI Apps
We've Got Apps Too
Get expert analysis, unrivaled access, and the award-winning storytelling only SI can provide - from Peter King, Tom Verducci, Lee Jenkins, Seth Davis, and more - delivered straight to you, along with up-to-the-minute news and live scores.