Chelsea grabbed a 1-1 draw in Istanbul on Wednesday.
But Drogba, the man who won Chelsea the Champions League in 2012 before leaving after eight trophy-filled years, is adamant his old club are not yet home and dry.
He said: "It will be a difficult game but at 1-1 the tie is still open. We're going to go there and try to create a big surprise.
"Of course I believe we can do it. If not I stay at home, I don't travel. I don't go to Stamford Bridge if I don't believe.
"I was pleased with the way we came back into the game. It was like being back in Cobham in a training session. It's going to be nice to have a good welcome back at Stamford Bridge.
"After the game, yes, I can show some emotion."
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