Manchester United are covering Nani's wages during his loan spell with Sporting CP.
Nani has returned to Sporting on a season-long deal as part of Marcos Rojo's move to United.
There was little chance of Sporting welcoming back their former star without United assisting with his wages.
Lisbon sources say United will pay €6 million of Nani's salary while he plays in Portugal.
The midfielder was given a hero's welcome as he touched down at Lisbon airport yesterday morning. He joined his new teammates for Sporting training in the afternoon.
