Chelsea have had a good break since their quarter final tie against Fenerbahce this week a they play Wigan on Monday night and Fergie thinks they have an advantage in rest time in the final weeks of the season.
"They've got a good rest for Monday and then three days later they've got Everton away and then they've got a five-day break before they play Liverpool," the United boss has said.
"Then they've got a four-day break before they play us in the league game. Our schedule is a bit more congested.
"But I'm sure Avram will go and complain to the league and make sure there's fairness by changing Chelsea's kick-off on the Saturday to the night time."