The Chelsea manager believes the Red Devils would not sell to a Premier League rival, though he suggests the club may attempt to offload the England striker in the summer
|25/4||Chelsea are 25/4 with Betway to beat Manchester United 2-0|
Mourinho, however, believes United will not sell to a "direct rival" and that they would instead only try to find a foreign buyer.
"I think maybe this summer they will try to sell to a non-direct rival," he told reporters on Friday.
"But they were very clear. Man United made it clear in the summer they don't swap or sell players to their direct rivals [Premier League teams].
"They were clear in the way they approached the Rooney situation. For them, it's pretty clear. They don't swap. They don't sell."
Chelsea face United on Sunday with Mourinho hoping to secure his 100th Premier League victory as a manager.
But Rooney will not play a part in that match after being ruled out through injury, along with fellow United striker Robin van Persie.