The Belgian, after failing to breach the Man United first team over pre-season, joined Sunderland on loan back in August.
He has gone on to make 24 appearances for the Black Cats, drawing mixed reviews from supporters after managing just one goal.
And Mourinho, speaking ahead of his side’s clash with Sunderland this weekend, noted that he had made a decision over Januzaj’s future but refused to disclose anything at this given time.
Mourinho also asked about Adnan Januzaj's future. Says he's made a decision but won't reveal what it is.
— Rob Dawson (@RobDawsonESPN) April 7, 2017
The message I get from this development is that Mourinho, after seven months of monitoring Januzaj’s progress, has seen enough. Waiting to see what Januzaj can produce as Sunderland desperately fight to stave off relegation would be a pointless exercise, with the brutal reality being that the youngster hasn’t done enough to stake a claim for a place in the first team next season.
He has produced the occasional moment of magic, of course, but that is far from sufficient when it comes to posing a challenge to the likes of Anthony Martial, Henrikh Mkhitaryan, Juan Mata, Marcus Rashford, Jesse Lingard and even Andreas Pereira, who has enjoyed a far more promising loan spell with Granada this season.