Mourinho has avoided getting drawn into a public chase for Perisic, claiming he had no idea what the latest news was after the club's pre-season 2-1 win over Real Salt Lake.
United and Inter are close to agreeing a transfer fee of £39.5m plus £4.5m in add-ons after weeks of negotiation.
Perisic, 28, is set to travel with the rest of the Inter squad on Tuesday but sources have told ESPN FC that United, who are now playing in the ICC tournament in the United States, are still confident of landing the Croatia global.
The Croatian is said to be desperate to make the move to Old Trafford and may have to wait longer as both clubs negotiate a deal, which is a shame because he'll miss out on Man United's tour.
United are keen to wrap up a deal so Perisic does not have to travel and are said to be increasingly hopeful of finalising terms.
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The Croatia global, 28, has been heavily linked with a move to Old Trafford for the majority of the summer, with recent reports (via Sky Sports) suggesting that a fee between the two clubs is close to being agreed.
If United are still interested in the player, it looks like there's still some way to go before any deal is completed.
The fact that Inter also signed a winger in Keita Balde seemed to pave the path for Perisic's exit.
However, despite Perisic not even being an official United player - linked with £44m move - the debates have seemingly already started and Nicol has revealed that he would choose the Reds' new signing over the Inter star every day of the week.