Arsenal will be without Alexis Sanchez for their Champions League decider

Arsenal have been hit by the news that Alexis Sanchez will miss up to three weeks with the hamstring injury he suffered against Norwich.

That means the Chilean will be unavailable for the Champions League meeting with Olympiacos, making the Gunners' task even harder. Arsene Wenger has come in for criticism for risking Sanchez against the Canaries, so the extent of the injury - reported by the Daily Mirror - will only make things worse. Wenger's side need to win by two clear goals in Greece to make it through to the knockout stages of the competition, and Alexis is not the only player missing for the clash. Santi Cazorla will join his team-mate on the sidelines after suffering an injury in the Premier League draw at Norwich, though there is a chance that Laurent Koscielny could return despite limping off in the same game. Arsenal are already without the likes of Jack Wilshere, Danny Welbeck and Francis Coquelin, so further injuries are the last thing they will have wanted.