The midfielder missed yesterday's win against Valencia amid talk of him being transfer-listed.
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Flick said, "On Monday he hurt his eyebrow and that's why he's staying home.
'I spoke to him to see how he was. I appreciate what type of player he is and what he is like as a person. I've talked a lot of things with him, but it's something between him and I. We have a good relationship.
"I know him. I have the feeling that he will stay."