Fellaini is confident the Red Devils can overturn the 2-0 deficit in their Champions League tie against Olympiacos and qualify for the quarter-finals.
He said: "We have the players to win the game.
"We have a chance and we must try to take it.
"We need the fans to stay behind the team and the club and we will fight to win in the game against Olympiacos.
"I'm sure it will be a good experience with the atmosphere at Old Trafford, but the most important thing is to win the game and hope it takes us through to the quarter-finals.
"We'll do everything we can to get there."
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