Tomas Rosicky sidelined after knee surgery

The 34-year-old, who agreed a contract extension at the end of last season, has been struggling with the problem since June following international duty with the Czech Republic.

Manager Arsene Wenger was set to give an update on the midfielder's fitness this week ahead of Sunday's Barclays Premier League trip to Crystal Palace.

However, Rosicky's agent confirmed to website fotbal.idnes.cz the player had now had "arthroscopic knee surgery", but it is understood any projected recovery time is yet to be determined.

Arsenal lost their opening game of the new Barclays Premier League season 2-0 at home to West Ham last Sunday and are also without midfielder Jack Wilshere because of an ankle injury.

While Rosicky is not a first team regular, his importance to this Arsenal team should not be underestimated. He has a wealth of experience and has that priceless ability to make the game look easy. He is one of Arsene Wenger’s finest options from the bench whether the Gunners are chasing the game or trying to see it out. His loss could represent a substantial blow.