Manchester City’s all-time leading scorer Sergio Aguero will be out for multiple weeks over a muscle injury.

City’s Spanish manager Pep Guardiola Monday has confirmed that the Argentine striker may miss the derby against city rivals Manchester United on Dec. 7.

”He has a tendon problem in front — so will be a few games out,” Guardiola said in a press conference ahead of City’s Champions League match over Shakhtar Donetsk.

“We will miss Sergio, we have had some problems with injuries but we will wait for him and meanwhile we have Gab and Sterling who can play in

Read more: Man City forward Aguero out for few weeks over injury