Arsenal manager Mikel Arteta admits he is "concerned" about Viktor Gyokeres' injury after the striker did not travel to Slavia Prague for their Champions League match.

Gyokeres came off injured at half-time of the 2-0 win over Burnley and has not travelled to the Czech Republic for Arsenal’s game on Tuesday night.

"He's definitely not available,” said Arteta. “He hasn't trained today and we need to do some more tests and scans over the next few days to understand the full extent of the injury. This game, he's not available.”

Asked if he is concerned or if this is a short-term issue, Arteta replied: "I am concerned. Because he hasn't had many muscular issues and he needed to leave the pitch and he was feeling something.

"It's never a good sign for a player who is explosive. We are digging in a little bit more to understand the extent and where we are in terms of the injury."

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