Mikel Arteta was asked about both in his post-match press conference, and this is what he told the media:
on Granit Xhaka...
He played at Bournemouth, he played really well, he was very committed, he played a really good game. After the game he started to feel ill. He had a temperature and he wasn't feeling good. The last two days he's been in bed. That's why he's not been selected.
on whether he wants him to leave...
I hope not.
on Calum Chambers...
The doctors are assessing him.