Chelsea must overturn a 3-0 deficit to reach the Champions League quarterfinals, but Lampard says they have a chance.
He said, "I believe we can, otherwise I shouldn't be here. We have to believe, more importantly the players have to believe as they take on this game.
"It's a huge task, no doubt. It's going to be extremely tough, but games have turned to big degrees, some famous games, great games, so we have to believe we have the opportunity to do something special.
"We have to go into the game with that thought, give everything to the game, play with confidence, and that's what I expect to see from the players. Not an attitude of this being a difficult match in a negative sense, it has to be a positive sense."