Sporting Lisbon have reportedly informed Manchester United that they want Nani on loan as part of a possible Old Trafford switch for Marcos Rojo.
Rojo is widely expected to leave Sporting this summer, with the Portuguese club banishing the Argentine international to their reserve team after his failing to show for training last week.
According to The Times, negotiations are at an advanced stage, but Sporting want to re-sign Nani on loan as part of the transfer.
Nani featured as a second-half substitute in United's 2-1 defeat to Swansea City on Saturday, but has reportedly now been axed from the first-team squad.
United are believed to have had a £17m bid rejected for Rojo.