Arsenal manager Arsene Wenger was counting the cost of a damaging night in the Capital One Cup as Alex Oxlade-Chamberlain and Theo Walcott will require scans on injuries picked up in the 3-0 defeat at Sheffield Wednesday.
Both England internationals hobbled off in the opening 20 minutes at Hillsborough - Oxlade-Chamberlain with a hamstring problem and his replacement Walcott due to a calf problem - and the extent of the injuries will not be determined until they have a scan within the next 48 hours.
The Gunners' night got worse after those withdrawals as a superb Wednesday side blew their below-par opponents away thanks to goals from Ross Wallace, Lucas Joao and Sam Hutchinson.
Wenger made eight changes to his side, but still named the likes of Petr Cech, Mathieu Debuchy, Oxlade-Chamberlain and Olivier Giroud in his starting XI.
And the Frenchman is ruing playing so many big names, despite the poor performance.
"The injuries are two muscular injuries, how bad the damage is I don't know," Wenger said.
"We have to have scans and we have to wait 48 hours for the scan. It was a bad night at the office for us. We lost the two players and after that we were not good enough.
"I have to manage the workload of the players and I think I maybe brought too many experienced players here.
"I am concerned, we have a big game on Saturday (against Swansea), we have Bayern in the Champions League coming up, already we are short.
"To lose two players is damaging for us, two offensive players. Ideally we would have loved to win, but with the squad we have got now, we cannot keep up in all the competitions."
Wednesday were well worth their victory at Hillsborough.Boss Carlos Carvalhal, who has overseen a nine-game unbeaten run in all competitions, knew his side were too good on the night.
"I am very happy about the victory, I think we deserved it," he said. "Everything belongs to the players, they were fantastic, we put a plan together and they did it 100 per cent.
"I am very happy about the players and for the club, it is an important victory for the club."