United boss David Moyes has repeatedly insisted Rooney is not for sale after Mourinho expressed his admiration for the striker last week on the Blues' arrival in Bangkok.
Rooney, who was left out of key games for United last season by Sir Alex Ferguson, departed Bangkok as Chelsea arrived in Thailand after a hamstring injury ruled him out of the tour of Asia and Australia.
"If Wayne is a second choice for Man Utd, then the national team will be affected," Mourinho told BBC Sport.
- Sports & Recreation
- Sir Alex Ferguson