Chelsea boss Jose Mourinho believes it would be "old fashioned" of Manchester United to refuse to sell Wayne Rooney to a Premier League rival.
Chelsea have failed with two bids for Rooney this summer amid reports United have no intention of selling the England international to another Premier League club.
The two rivals meet at Old Trafford on Monday night, and speculation has claimed Chelsea will make a further bid for Rooney after the game.
Mourinho does not want to see the 27-year-old sold abroad and believes Rooney will be the "final piece in the jigsaw" if he lures the forward to Stamford Bridge.
"To me it is not a difficult decision because you want very much to keep Rooney or you don't want to keep him?" said Mourinho.
"But that old-fashioned mentality of, 'I don't sell players to clubs in the same country' - I think doesn't help.
"Sometimes you push players abroad when you should be keeping them in your league because then you are contributing to making your league the...