Arsenal boss Arsene Wenger has expressed his frustration after Mikel Arteta and Yaya Sanogo suffered injuries during the 2-0 Champions League victory over Borussia Dortmund on Wednesday night.
The Gunners secured qualification for the last 16 following a 2-0 win over Dortmund and can even top the group should they beat Galatasaray in their final game and the German side are beaten by Anderlecht, who have nothing to play for.
But once again Arsenal paid the price for victory with a new injury blow, as Arteta was replaced by Mathieu Flamini with a calf problem during the second half.
"The injury situation is an issue. Arteta's looks quite serious and we lost Sanogo too," he said in the press conference.
"Mikel Arteta's injury doesn't look good. It's a calf. I think he will be out for a while," the boss confirmed.
"The injuries are difficult to take on the chin. We go into many games and we need as many available."
Asked about Jack Wishere, the manager said the midfielder "will see a specialist on Thursday" to know whether he will require surgery and how long he will be out of action following his latest ankle injury suffered against Manchester United.
Meanwhile, the French boss was happy after how Arsenal put behind them the disappointed back-to-back defeats to Swansea City and United to get the three points.
"Maybe we were defensively better tonight. We are a team that likes to go forward - sometimes we feel dominate the game and we maybe forget to take precautions to defend. We did that better tonight.
Yaya Sanogo opened the game with his first goal for the north London side in 19 appearances, since his since his move in summer 2013, while Alexis Sanchez sealed the victory in the second half with superb curling shot.
"Alexis Sanchez has given unbelievable fighting spirit. A mixture of talent and desire," he said.
"I like what Yaya Sanogo did tonight. We went long on him. What he did on his first goal is class.