United secured a two-legged semi-final against Sunderland with a 2-0 win over Stoke, while Manchester City will need to get past West Ham to set up an all-Manchester showpiece final.
But Evans is refusing to look past Sunderland - a team he has good memories of after spending two loan spells at the Stadium of Light.
"That is dangerous talk," said Evans, when asked about the potential for a first final showdown between United and City.
"I watched Sunderland beat Chelsea the other night and not only are they fighting for Gus Poyet, but he has also got them playing some good football.
"They controlled large parts of the game and had some good possession. It will be a more difficult game than people will imagine."
"I loved my time at Sunderland," added Evans.
"In my first season there we won the Championship with Roy Keane as manager and the next season I went back and managed to stay in the Premier League, which was a good achievement.
"It gave me a good platform to return to United and fight for a first-team spot."
After suffering shock back-to-back home defeats by Everton and Newcastle, United have gone on a decent run winning three on the trot without conceded a single goal.
Evans has played in the last three wins but still does not feel his place is guaranteed in David Moyes' first-choice line-up.
"I haven't been given that feeling by the manager," said the Northern Ireland international.
"It's only four games in a row I've played now and there have been some injuries.
"It's been the same scenario over the past couple of seasons.
"You can't look too far ahead."