Sevilla have confirmed Samir Nasri suffered a hamstring injury in their match against Sporting Gijon on Saturday.
The 1-1 away draw saw Jorge Sampaoli's side drop down to fourth in the table, with the on-loan Manchester City star - who has made an impressive start to his Sevilla career - having to be replaced at half-time.
Reports in Spain suggest Nasri will miss Wednesday's home Champions League game against Dinamo Zagreb as a result and is a major doubt for the crucial LaLiga match against Barcelona on Sunday, also at Ramon Sanchez Pizjuan.
"Tests reveal Samir Nasri has suffered damage to his left hamstring," the club said in a statement on Monday.
"He will undergo further tests to determine how long he will be out."
Forward Wissam Ben Yedder (ankle) came off in the second half of the match at Sporting and is also set to miss the Dinamo game.
Tests reveal has suffered damage to his left hamstring. He will undergo further tests to determine how long he will be out 31 October 2016
‘Thierry Henry was my hero, but when you talk about players who have a wand of a left foot, he genuinely had that. He made my life so much easier on the right’: Ex-Arsenal star omits Gunners legend from his Perfect XI
Who is Sonia Bompastor? Everything you need to know about the Chelsea women manager
