Socceroo Mat Ryan goes under the knife

Valencia goalkeeper Mat Ryan will be out for at least four weeks as he undergoes surgery on his right knee.

The 23-year-old Socceroo has been ruled out of two upcoming World Cup qualifiers after retiring hurt in the 1-1 home draw with Deportivo La Coruna on Sunday.

Ryan made the high profile move to the Spain from Club Brugge in the offseason.

The injury is a major blow for the Australian who has been in scintillating form and started all four games for the La Liga club in domestic and Champions League qualifiers.

Brazilian goalkeeper Diego Alves, is still some months away from returning to fitness, leaving the battle for the No.1 spot between Yoel and Jaume Domenech.