The English top-flight campaign remains the only major European league to play throughout the Christmas period, while this past weekend saw all 20 teams having played two games in the space of as many days.
The clubs will once again all be in action on January 1, and Rooney, who started for the Red Devils both on Friday and Sunday, feels consideration for player fitness needs to be taken into account when planning the fixture list.
“It is not easy playing two games in two days and you do lose a lot of the quality from both teams,” said Rooney.
“It is difficult. We started so well in the first half but in the second half it was tough and hopefully in the future it has to change.
“It will probably take someone getting a really bad injury from doing it (playing twice in two days), which no one wants to see, but it is very demanding and I think it does need looking at.
“With the weather as well, with the fans coming from London or travelling from Manchester, it has been tough. It is a lot of money to spend over Christmas as well. But it is what it is, we have to deal with that and have to try and perform well.”