Villa meet Bradford at Valley Parade in the first leg of the Capital One Cup semi-final on Tuesday knowing they are heavy favourites to overcome the League Two outfit. Regardless of the level of opposition, though, Lambert knows reaching the final would be huge for the club.
"For this club to get to Wembley again would be extraordinary," he said. "In a one-off game there you just never know what could happen. To get there I think every player would tell you would be absolutely phenomenal."
Asked whether it would surpass any of his previous achievements, the former Scotland international said: "I think it would, yes.
"I never view it as any great achievement on my own behalf. It's the players and the fans. I never really look at myself and think `I'm going to do that' because it is irrelevant. The important thing is what happens to this club and the players."
Bradford are without a win in their last three games but Lambert knows they will dig in and come up with another 10% for the two-legged tie.
"Of course it will," he said. "It will be a different team to the one that got beaten by Barnet at the weekend. You have to withstand that and be ready for it.
"The Bradford lads will give it everything they have got to try to turn us over. If we do what we have been doing that of late and match that then we'll see what happens.