Boss Arteta confirmed that the defender is contention to be involved at the Estádio José Alvalade. He said: "Everybody in the squad is fully fit and available to start the game. We have Kieran Tierney after a long injury, it’s great news that he’s back, he’s been training with the team and he’s at the level to participate."

We told you last week how former Celtic left-back Kieran Tierney returned to training with Arsenal's first team. He has now taken the next step in his recovery.