The Blues have seen two bids for the unsettled forward rejected by the Premier League champions, with manager David Moyes insisting the England international is not for sale.
Goal revealed on Wednesday that United is planning on re-opening discussions with Chelsea as it looks to include Juan Mata as part of any deal - but Mourinho insists no talks will take place before Monday.
"We did [bid for Rooney] before and we will do [again] later," the Portuguese told reporters after Chelsea's 2-1 win over Aston Villa.
"[But] I don't want Chelsea to do it before we go there ... from the ethical point of view."
On the night, Chelsea was pushed all the way by a revitalized Villa, with Antonio Luna's own goal and a late Branislav Ivanovic header maintaining the Blues' 100 percent start to the Premier League season.
There were question marks over whether Ivanovic should have been given his marching order minutes before netting the winner after appearing to elbow Christian Benteke, but Mourinho deemed the incident as "50/50".
"That was very hard. I missed that about the Premier League! Normally matches in the Bernabeu we win every match very comfortable, this was very hard, it's what I like. I told Paul Lambert that they deserve a point, it wouldn't be unfair.
"Benteke makes a lot of fouls and the opponent who plays against him has to make a lot of fouls.
"Paul Lambert reminds me of me at his age. Now I complain with some decisions, at his age I complained at every decision. Paul complains at every decision, I was the same. Benteke and Ivanovic, they are two giants, it was 50/50."