Arsenal have provided an injury update on Scotland international Kieran Tierney after he limped off against Liverpool last night.
The former Celtic man was forced off just before the break as the Gunners lost out 3-0 to Jurgen Klopp's side at the Emirates.
After the game Mikel Arteta explained that Tierney felt pain in his knee before signalling to come off.
He said: "He felt something with his knee. He was in pain. It looks like he will be injured but we don't know for how long."
Arteta also gave an update on David Luiz who is expected to go under the knife due to a knee injury.
He added: "There a few possibilities on that, being a little more conservative with the treatment or having to go for a surgery.
"We are talking with the doctors at the moment to make the right decision on that but we'll see. He could be out for a few weeks at least.
"It will depend what the decision we take is. If it's more conservative, it will be short-term. If it's a bit more radical with what he needs, it will take longer."
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