Despite the missing duo Wenger is confident his side can claim a first trophy since 2005 if they play their own game rather than worry about the occasion.
"Cesc is sad and disappointed of course, but it could have been worse, the injury is a very small one," Wenger said.
"We have so many targets in front of us, it is important that he is not out for longer.
"Now what is important is the team and the squad focuses on the game we want to play on Sunday. Ideally you want everybody fit, but before the season starts you know you can have some player’s injured.
"We can deal with the fact that Cesc will not be there, Walcott will not be there and, of course, [Thomas] Vermaelen will not be there.
"When you look at the squad we have and the number of players we have available, we have enough quality players to deal with that."
However, Wenger added: "What is important when you go into a final is that you give absolutely everything. You do not want to go into a final with fear that if you lose, it will be dramatic.
"What you want is to go into the final and give everything to win it and that is how we approach the game."