A troublesome thigh injury is set to rule Juventus midfielder Sami Khedira out of a top-of-the-table clash with Napoli and possibly a key Champions League last 16 fixture with Bayern Munich.

Khedira was forced off at half-time on Sunday when Juventus routed Chievo 4-0 in Verona to stay two points behind Serie A leaders Napoli.

But despite trying to reassure fans afterwards with a positive message on his Facebook page, the Germany midfielder is facing two to three weeks on the sidelines, according to Juventus.

A statement from Juventus said Khedira "was subjected to scans which revealed damage to the long adductor (in his right thigh) after the pain from the match in Verona failed to dissipate.

"He will be sidelined from competition for two to three weeks."

The absence will see Khedira miss upcoming league games against Genoa, Frosinone and Napoli, the latter scheduled for February 13 in Turin.

But Juve coach Massimiliano Allegri could miss Khedira most if he is forced out of their Champions League last 16 opener with Bayern on February 23.

Juventus overcame Real Madrid over two legs in the Champions League semi-final on their way to meeting Barcelona in the final, only to be outclassed 3-1 in Berlin last May.

Ahead of welcoming Bayern to Turin on February 23, Juventus will be hoping Khedira recovers in time -- although it is not the German's first injury knock this season and he is known not to recover quickly.

Allegri led Juve to their first league and Cup double last season and is hoping for a repeat this campaign. The champions are away to Inter Milan for the second leg of their Cup semi-final on March 2 or 3, having won the opening leg 3-0. AC Milan beat Alessandria in the other Cup semi first leg.