Arsenal will be sweating on the fitness of Alexandre Lacazette after the striker injured his ankle in the Emirates Cup defeat to Lyon.
Head coach Unai Emery already had a headache after deciding not to involve Sead Kolasinac or Mesut Ozil after the pair were left distracted by a failed car-jacking last week.
The Gunners lost 2-1 to Lyon as a Moussa Dembele double cancelled out Pierre-Emerick Aubameyang's opener.
But it was the sight of Lacazette, voted Arsenal's player of the season last year, sporting a protective boot that will have Emery concerned just two weeks away from the start of the Premier League campaign.
"It's in his ankle," Emery said of Lacazette's injury after he was replaced by Reiss Nelson less than 15 minutes into the friendly clash.
"He will probably be assessed over the next few days – but it's not serious.
"We are thinking it's not important, he decided with the doctor and with me that it is better to take no more risk.
"He tried to continue playing but I think it was better in the pre-season to take patience.
"The doctor said to me he is going to check tomorrow but the thinking is that it is not important."
Lacazette told French reporters he had twisted his ankle as he left the Emirates Stadium limping with a protective boot on his right leg.
Emery opted against playing new signings Dani Ceballos and Gabriel Martinelli from the start, both coming on in the second half as the latter scored a scrappy goal only to see it chalked off for handball.
But it was the omission of both Ozil and Kolasinac from the matchday squad which caught the eye.
The club and both players insisted they were fine following an attempted car-jacking – but PA understands Emery spoke to them ahead of the game and decided not to involve them.
"Every player is very important in the team, but also each moment and some circumstances give us a decision between the player and us," said the Spaniard in his post-match press conference.
"It's not a good moment to play because their mind is not now 100 per cent. It's a very personal circumstance and the most important thing now is that they can feel good, they can feel safe, they can feel calm with their family.
"They came this morning but I spoke to them and decided it was best to continue their resting with their families and wait for a few days to hopefully come and start normally with the team."
Asked if the duo would be afforded more time off, Emery added: "We are going to see each day.
"Tomorrow we are going to check again how they are. This morning they came here but weren't ready to play the match."
Meanwhile, it is believed Arsenal are interested in signing Lille winger Nicolas Pepe – with reports in France suggesting a deal could be struck for the Ivory Coast international as early as Tuesday.