Nicklas Bendtner has been ruled out of Arsenal's clash with Olympiakos after being involved in a car accident.
The young striker was on his way to training on Sunday when his Aston Martin left the road and collided with the hard shoulder fence and a tree.
The East of England Ambulance Service said the Denmark international had had a "very lucky escape", suffering a pain in his shoulder and grazes on one of his knees.
Bendtner, who played the full 90 minutes of Saturday's 1-0 win over Fulham, is expected to be back for next weekend's clash with Blackburn.
"Nicklas did not practice because he had a car accident yesterday," said Wenger.
"Fortunately there was no real long-term damage, but he was bruised and we thought it was better he did not train.
"He should be back for Sunday's game [against Blackburn]."
Theo Walcott misses out again as he continues his recovery from a back injury, but Eduardo is available after missing the win over Fulham.
Wenger believes Walcott could return to action against Blackburn on Sunday and he plans to play the England winger in a practice match so that he can work on his fitness.
"He's available, but he is short of competitiveness at the moment," Wenger said of Walcott.
"He needs a game and we will organise a game for him.
"He should be back to normal again from Sunday onwards."