• Austria's defender David Alaba lies injured on the pitch during Austria'a clash with Georgia (AFP)
Carlo Ancelotti will be without either of his preferred left-back options after Bayern Munich confirmed an injury lay-off for David Alaba.

Alaba suffered an ankle knock in Austria's World Cup qualifying clash with Georgia and had to be withdrawn prior to half-time on Tuesday.

The length of the lay-off has not yet been determined, but it leaves head coach Carlo Ancelotti without either of his natural left-back options as Juan Bernat continues his recovery from ankle surgery.

However, there is some good news for the Italian with midfielder Sebastian Rudy cleared of injury.

The 27-year-old was taken off as a precaution in Germany's 6-0 rout of Norway but has been deemed fit to re-join training on Thursday.

German champions Bayern visit unbeaten Hoffenheim in the Bundesliga on Saturday.