Arsenal defender Takehiro Tomiyasu is being assessed to ensure he is 100 percent fit.
The right-back has been very important to the Gunners so far in all competitions this season.
However, manager Mikel Arteta confirmed that Tomiyasu may have to get some tests on his calf.
"He felt something. I don't know if it was fatigue," the Arsenal manager stated after a win over Wolves on Saturday.
"We decided to change straight away and we didn't want to take any risks. Let's assess him and see how he is."
"We assessed him after the game. We took him out for precaution," he then added on Monday.
"We will wait. Whether it's useful to use him we'll decide tomorrow. He's a strong boy hopefully he'll be fine."