Worse than that, Mourinho effectively let De Gea off for the summer when he said that the next time he would play would be in Manchester United's pre-season tour in America.
But with Sergio Romero and Joel Pereira set to play the last two games of the campaign, many people have speculated that De Gea is therefore on his way out of the club.
Losing De Gea would be a big disappointment for United fans but bringing in Oblak as his replacement would certainly ease the blow as I think he'd be a superb signing if they could pull it off.
And Goal understands that Madrid - who motivated Chelsea and United's interest in Oblak with their reported interest in Thibaut Courtois and David de Gea - are ready to consider an offer for the 24-year-old as an alternative to current No. 1 Keylor Navas.
Mourinho has made grandiose claims that the Europa League is the most important trophy in Manchester United's history.
Indeed, the Slovenian is one of the few goalkeepers on a similar level to the Spaniard, and, as such, his arrival to replace De Gea would ensure a smooth transition.
The United manager added though that even though De Gea won't play, he feels he is one of the top keepers "in the world" and for that reason alone "we want to keep the top in the world." .
"And now with the confidence that Jose gives me, the confidence the players give me and the confidence I have, this is very important and I will try and do my best for for the team".