The Gunners found out before their game with Leyton Orient that an Old Trafford date awaited the winners - still to be determined after substitute Jonathan Tehoue's late goal earned Orient a replay.
Wenger said: "Somebody told me the draw as we came out before the game started.
"It is television now which basically dictates these kind of rules but that would not be an excuse for us to draw today.
"Leyton Orient played a great game, but we could not finish them off.
"It is an interesting and an exciting draw.