Mesut Ozil is set to miss Arsenal's clash with Liverpool at Anfield on December 29.
The German has started the last two matches but was withdrawn at half-time of the draw with Brighton on Boxing Day. (via Mirror
Ozil had trained with the squad on Friday but wasn't pictured with the team when they arrived to Merseyside.
He has reportedly complained of pain in his knee and the Arsenal boss Unai Emery didn't want to risk him.
The Arsenal star hadn't started a league match in 6 weeks before returning to impress in the win over Burnley.
Unai Emery is also dealing with injuries of other key players, including Henrikh Mkhitaryan, Hector Bellerin, Shkodran Mustafi and Nacho Monreal and Emile Smith Rowe.