With a six-point advantage and just three games remaining, it is hard to see out-of-form Tottenham clawing back the deficit even if they manage to win Tuesday night's Premier League tussle with City at Eastlands.
A home win will end all debate on the matter though, which is why Mancini wants to get the job done.
The Italian's worry is that his key men may end up tired, which will hamper preparations for the Blues' first final appearance in 30 years.
"I don't think we have a problem for fourth spot," he said. "We still have three games left and we only need three points. But it was important we beat Everton because we have to prepare well for the final.
"Now I shall play with all the team against Tottenham because we want to win. That is not perfect for the final."
Source: PA
Source: PA