Friday 6 April 2018 13:38, UK
Arsene Wenger fears Henrikh Mkhitaryan could be out for a number of weeks with a medial knee ligament injury.
Mkhitaryan was forced off in the 4-1 win over CKSA Moscow in the first leg of their Europa League quarter-final on Thursday.
He will have a scan on Friday to assess the extent of the damage, but Wenger confirmed the midfielder will miss Arsenal's game against Southampton on Sunday, live on Sky Sports Premier League.
Asked if Mkhitaryan could be out for a number of weeks, Wenger told Sky Sports News: "I fear yes, I hope I'm wrong."
Goalkeeper David Ospina will be out for up to three weeks, Wenger confirmed, while Ainsley Maitland-Niles is also unavailable for Sunday's game.
Alexandre Lacazette has not started a Premier League game in over two months, but played in place of cup-tied January signing Pierre-Emerick Aubameyang in Arsenal's Europa League game this week.
Lacazette, 26, scored a brace in the victory, taking his tally to three in five days since his comeback from a knee injury.
The £50m summer signing managed just three in his first four months with the club, but Wenger is confident there is room for both Lacazette and Aubameyang in his side.
"Aubameyang I knew could play on the left," said Wenger, who would not confirm if the pair will start on Sunday.
"He played there a long time. They can play together through the middle, with Lacazette as centre-forward and Auba on the left, and with Auba up front and Lacazette behind. That's an opportunity as well."