The Bhoys will take on their Scottish Premiership rivals in the Scottish League Cup final at Hampden Park in Glasgow.
Ronny Deila’s side will head into the clash on the back of a 1-1 draw with United away from home in the Scottish Cup quarter-finals.
Celtic’s performance at Tannadice Park last weekend was far from impressive, but Stokes is confident that on Sunday, the players will step up.
"We just need to focus on ourselves, worry about our performance, and if we perform to the standards we are capable of, then we will win the game,” the 26-year-old told Celtic’s official website.
“You just need to treat it like another game,” added the Republic of Ireland international. “It will be a difficult game on Sunday and knowing a trophy is there to be lifted lifts everyone.”
Can Celtic win on Sunday?
Celtic will head into Sunday’s game as favourites, although they cannot be complacent as United showed last weekend what they are capable of.
The Dundee-based side will probably feel that they have an edge given the way they stopped the Glasgow outfit from winning last weekend, but the Bhoys will be determined to bounce back in style.
Celtic should not dwell too much on last weekend’s game and must maintain focus throughout the 90 minutes.
Manager Deila has a squad which is better than his United counterpart, and he must make sure that the players know that.