Arsenal striker Viktor Gyokeres will undergo further tests this week amid fears he has suffered a hamstring injury.
The Sweden international was withdrawn at half-time in the Gunners’ victory at Burnley on Saturday having scored the team’s opener.
Speaking before the Champions League match against Slavia Prague on Tuesday night, Arsenal boss Mikel Arteta said: “I am concerned because he hasn’t had many muscular issues and he needed to leave the pitch and he was feeling something.
“That’s obviously never a good sign, especially for a player that is very, very explosive.
“So we are digging in a little bit more to understand where we are in terms of the injury and we’ll announce the moment we know.”
There is hope that the decision to withdraw Gyokeres at half-time at Turf Moor has prevented further complications, with initial thoughts being that the 27-year-old will miss at least two weeks.
After the game with Slavia Prague, the Gunners face Sunderland on Saturday before the majority of the squad leave for the international break.
Arsenal’s first game back after the internationals is the north London derby against Tottenham on 23 November.
Sweden head coach Graham Potter is set to name his squad for the World Cup qualifiers against Switzerland and Slovenia, with there now doubt over Gyokeres’ inclusion.