Arsenal's defensive woes are mounting with Shkodran Mustafi ruled out for six weeks due to a hamstring injury, while Sead Kolasinac and Laurent Koscielny are doubts for this weekend.
Mustafi was forced off in the first half of Germany's 5-1 World Cup qualifying victory over Azerbaijan on Sunday and is not expected to return until after the next international break.
Kolasinac only managed one half while in action for Bosnia-Herzegovina against Belgium due to a hip injury, while Koscielny is set for a late fitness test on an Achilles injury.
Consequently, manager Arsene Wenger has concerns about how his defence will look for Saturday's Premier League trip to Watford.
Joachim Low: "With Mustafi it seems that it is muscle tear or some muscle fibre tear. In any case it could force him to a longer break." pic.twitter.com/TR9OKEjF5j— Squawka News (@SquawkaNews) October 8, 2017
"The minor problem we have with Sead Kolasnic, we'll check him today, it's a hip problem," the Frenchman said on Thursday.
"We've lost Mustafi for about four to six weeks. I don't think he'll be available before the next international break.
"Koscielny has a definite final test tomorrow. At the moment, he's not available. He trained on his own and the first signs are positive.
"I have [concerns about the line-up]. I think about sorting out the problem, but overall I will decide completely tomorrow the line-up because Koscielny will have a test. It looks like if he survives the test he is capable to play."
Arsenal are on a run of four consecutive wins in all competitions and have not lost since the 4-0 reverse to Liverpool in August.