Following runs to the sharp end of both domestic cup competitions United head into the clash with Celta Vigo in the Europa League semi-finals this evening fresh from nine games in April alone.
Mourinho has consistently bemoaned the fixture pile-up this season and has said he's ready to rest players against Arsenal this weekend and would even field a reserve side against Crystal Palace on the final day of the season should he need to.
But Wenger, who has famously never beaten his great rival, says having so many games at the end of a season is a sign you're doing something right.
“Normally a hectic schedule is what you want and shows you are in the competitions and overall if you have no big injuries we are all equipped to deal with that," he said in his pre-match press conference on Thursday.
"What has changed in the Premier League is look at the teams who in the positions 10-20, there are still some top players on the bench.”
With the second-leg of the semi-final with Celta scheduled for just four days after Sunday's game Mourinho has said he'll rest his key players where necessary at the Emirates.
But Wenger is sure whatever team the Portuguese selects it'll be a strong one.
"We focus on our performance," he said when asked about Mourinho's comments. "I don’t know what Man Utd will do. We know anyway they have a massive squad with quality players and only a top performance will get us the win we want.
"The only advantage we can give is to focus on ourselves not a weaker Manchester United. No matter who plays they will have a strong team out.
"What I want is that my team turns up with a strong performance on Sunday."