Manchester United winger Nani is unaware of a clause that would allow him to end his loan at Sporting Lisbon and return to Old Trafford in January.

The Portuguese international was deemed surplus to requirements at Old Trafford this summer and was eventually used as a makeweight in the deal that brought Marcos Rojo to Old Trafford.

On his return to former club Sporting on a season-long loan, Nani has enjoyed a remarkable reversal in fortunes, rediscovering the form that was so often absent at Old Trafford.

The former United No.17 was recently voted the best player in the Portuguese League so far this season, and with Angel di Maria struggling to replicate his stunning form from earlier this season, reports have suggested Louis van Gaal will consider bringing him back to Old Trafford earlier than planned.

The Portuguese international, however insists he is unaware of any clause in his deal that would allow that to happen.

"I think there is no clause but I leave that for others to solve," Nani was quoted as saying by A Bola.

"It is always good to feel the affection of the fans. They want me back because they recognise that I am in good form and can be an asset for the club.

"That is football. Sometimes we are praised and sometimes we are criticised."

Nani delighted and frustrated in equal measure during his seven years at Old Trafford but could yet have a future at the club should he continue to impress.

The 27-year-old signed a new five-year-deal in the summer of 2013, but a series of injuries saw him make just seven appearances for the club during David Moyes' ill-fated spell in charge.

While his prominent role in Sporting's season has once again raised questions over his immediate future, Nani recently claimed he was not focusing on the prospect of an early return to Manchester.