According to the Daily Star, former Man United defender Mikael Silvestre expects both of these players to leave.
Silvestre won five Premier League titles at Old Trafford.
The French international revealed he was not surprised by Di Maria’s disappointing 2014-15 season.
“Over the years it’s been difficult for South American players to adapt to the Premier League,” Silvestre said.
Di Maria is on the verge of being signed by Paris Saint-Germain for £45m even though he has joined Man United on their pre-season tour.
De Gea has not received any offers from Real Madrid, but he has been heavily linked to them as he has expressed his desire to return to Spain.
However, he is expected to stay with Man United for the time being and may even play out the final year of his contract.