Arsenal boss Arsene Wenger was left disappointed with their defending after Chelsea came from behind to win 2-1 in their FA Cup semifinal at Wembley.

The Gunners took the lead through Theo Walcott but goals from Florent Malouda and Didier Drogba were enough to send the West London club into the FA Cup final.

Wenger believes Arsenal gave away "cheap" goals and also criticised the state of the pitch at Wembley, although he refused it as an excuse for the Gunners' defeat.

The Frenchman said: "It was a game where any mistake in the end could be costly.

"It is disappointing because we had a good start and after we dropped off.

"The game looked as through it would finish as a draw - I felt we gave two cheap goals away."

Goalkeeper Lukazs Fabianski appeared vulnerable throughout and should have done better with the goals.

Wenger went on: "I feel sorry for him because he is a great goalkeeper.

"But we have to take that on board."

He still showed his unwavering belief in his young side though saying: "When you are so close and you are 20 years of age I don't know why you would be desperate."