1140 GMT April 07, 2020
The Spanish goalkeeper's current deal runs out in the summer — although United does have the option to extend this by a further year — and talks have been ongoing for several months, skysports.com reported.
When asked if he was confident of keeping De Gea, Mourinho was unsure on whether the goalkeeper would stay with the club, but said he is not concerned by the situation.
"I am not confident," he told Sky Sports.
"I cannot find the word in English, but let's see what happens.
"Only the club, David and his people can answer that. My comment is only that everyone knows how good he is, how important he is for Manchester United and, if the club want to be better than it is and not worse, obviously it would be very important to keep David."
De Gea is one of 10 United stars whose deals expire next summer but Sky Sports News reported in the summer that the club was confident of tying the Spain keeper down to a new deal after Real Madrid —which had long courted De Gea's signature — signed Thibault Courtois from Chelsea instead.
Sky Sports News reported on Thursday that Anthony Martial — another player whose deal expires in 2019 — has rejected United's latest contract off but remains in negotiations in pursuit of an agreement.
Luke Shaw recently signed a new five-year deal but doubts remain over skipper Antonio Valencia, Juan Mata, Ander Herrera, Ashley Young, Chris Smalling, Phil Jones, Matteo Darmian and Andreas Pereira.
Manchester United welcomes Everton in the Premier League on Sunday afternoon.