He has played 44 games in all competitions this term and missed three outings because of a suspension, scoring 28 goals in the process.
Ibrahimovic has played more games than any Chelsea player this year and the only United player to have starred in as many games as him is Paul Pogba.
Zlatan Ibrahimovic suggested Chelsea's season could be different if they were in Europe
Ibrahimovic continued by praising Chelsea's squad
With Chelsea not playing European football this season, Antonio Conte's men have often had a week to rest between matches.
And Ibrahimovic suggested Chelsea's season could have been different had they been playing in Europe.
"I think they are a good team," Ibrahimovic said after Thursday's 1-1 draw with Anderlecht.
Manchester United v Chelsea: Eight things that will definitely happen Sat, April 15, 2017
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1. Man United fans will be baffled by a rotated Jose Mourinho team
"Overall a good team and then of course they are playing once a week which makes a difference also because at the end of the season, I don't know how many games we have in total but I think we have much more than them.
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"They haven't been playing in Europe this season and they went out from the League Cup early.
"But they have a great team, or else they would not be number one."