According to David McDonnell in the Mirror, Mata's representatives were "sounded out" about a potential switch to China. However, the proposal was rejected.
McDonnell added United will trigger a one-year extension on Mata's deal—which is worth £165,000 per week—that will tie him to the club until 2019 and that fellow Spaniard Ander Herrera will be handed a new deal.
Mata, 29, remains a key player for manager Jose Mourinho because of his immense experience and enduring creative qualities.
Despite Anthony Martial, Jesse Lingard, Marcus Rashford, Henrikh Mkhitaryan and Herrera's presences in the squad, Mata has started six of United's seven Premier League games this term, netting one goal.
The same has not been true for Herrera, who has found his opportunities limited in 2017-18 despite winning the Sir Matt Busby Player of the Year Award last season.
Summer signing Nemanja Matic and Marouane Fellaini have kept the former Athletic Bilbao man out of the starting XI, meaning four of his five Premier League appearances this term have come from the bench.
However, per McDonnell, the Manchester club is preparing to offer Herrera a new deal "to reflect his enduring value to Jose Mourinho's side."
The 28-year-old is sure to have a key role to play yet in 2017-18 given United will be looking to compete for silverware on a number of fronts.
With Fellaini and Paul Pogba out injured, Herrera is likely to start in the centre of midfield for United's huge clash against Liverpool at Anfield on Saturday.