Evans and his team-mates, many of whom were away on international duty last week, will head for Chelsea at Monday lunchtime for their quarter-final replay still feeling the after-effects of Saturday's hard-fought victory at Sunderland.
It is a situation the Northern Ireland defender admits he has not encountered before, and one which represents a new challenge.
Evans said: "I have never really been in that situation before, so it will be new to probably most of us.
"It's just all about tonight [Saturday]. We will probably go back and get a good recovery session in and make sure we have done everything we can physically to make sure we are right for the game on Monday."
Evans will make the trip to Stamford Bridge hoping for a start after getting his chance on Wearside as a first-half substitute when full-back Rafael da Silva limped off.
Chris Smalling moved from central defence to right-back to accommodate the 25-year-old as a United defence which had been criticised earlier in the campaign recorded its sixth successive league clean sheet.
That miserly run is in no small part due to the return to fitness of Nemanja Vidic, Rio Ferdinand and Phil Jones, and Evans knows competition for places has intensified significantly.
Asked about the difficulty of competing with Ferdinand and Vidic for a place in the heart of the back four, he said: "You are always competing.
"Even if one of those two isn't fit, you have got Chris Smalling, who started at centre-back today. I'm sure he was disappointed to get moved to right-back, it's not his favourite position, but for the sake of the team, he did that.
"Phil Jones is another one. The competition is all over the pitch. You look at the players who didn't start today [Saturday] or have been left behind - it's some team, really."
Monday night's game represents an opportunity to keep hopes of yet another Double alive with United marching inexorably towards the league title.
Their recent surge - they have now lost only once in 22 games in all competitions, and that in controversial circumstances to Real Madrid in the Champions League - has been based on defensive resilience rather than attacking flair, and Evans admits it is a pleasant change for the men at the back to receive the plaudits normally reserved for their attacking colleagues.
He said with a smile: "You have probably noticed we haven't scored as many goals. It's getting that fine balance.
"We will take it the way we are at the minute. Especially as a defender, it's better to keep clean sheets than having the forwards getting all the glory, I suppose, so we are just happy.
"Clean sheets, that's what we want as defenders, so we are delighted with that."
Sir Alex Ferguson used the depth of his squad at the Stadium of Light with Ferdinand, Ryan Giggs, Paul Scholes and Wayne Rooney not even making the 18.
Da Silva must be a doubt after being unable to continue against Sunderland, while Vidic was left clutching his back after a rugged challenge with striker Danny Graham, although he made it through to the final whistle.