Recent speculation has suggested the 26-year-old is considering his future, after falling down the first-team pecking order at Old Trafford.
Red Devils boss Sir Alex Ferguson is keen to retain the Portuguese international's services, but understands the player's desire for regular football.
Nani was called into a meeting last week to be told that Manchester United would not budge on their original offer, with the former Sporting Lisbon star believed to be holding out for closer to £130,000-a-week in wages.
After arriving in England from his native Portugal in a £14million deal in 2007, Nani initially saw his progress stunted by the form of compatriot Cristiano Ronaldo.
But, after Ronaldo left for Real Madrid in 2009, the attacking midfielder started to make his mark, with his stand-out campaign coming in 2010/11, when Nani claimed Manchester United's Player of the Year award in 2010/11.
However, after a recent spate of injuries, Nani now appears out of favour with Ferguson, and could push for a move away from the Premier League leaders.
With less than 18 months to run on his existing deal, Manchester United chiefs are now turning up the pressure on Nani to commit either way, with his failure to sign a new contract likely to see him leave Old Trafford at the end of the season.