Scarlett, 17, was handed his senior debut for Spurs by Mourinho last season, replacing Lucas Moura as a substitute in their Europa League clash with Ludogoretz.
At 16 years and 237 days he became the youngest player to ever feature for the north London club, however that record was taken by fellow youngster Alfie Devine just months later.
The Hillingdon-born starlet also made his Premier League debut against West Brom back in February, with Mourinho making his admiration known before he was sacked by Spurs in April.
Jose Mourinho, Manager of Tottenham Hotspur interacts with Dane Scarlett of Tottenham Hotspur during the UEFA Europa League Round of 32 match between Tottenham Hotspur and Wolfsberger AC
Speaking after his departure, the Portuguese boss waxed lyrical about Scarlett, comparing him to Rashford and tipping him become a first-team player at Spurs next season.
“He is a diamond, a kid with incredible potential,” Mourinho told BT Sport.
“He has worked many times with the first team and that gives him a different personality. He is still 16, 17 soon [in March] and I believe next season he will be a first-team squad player because he has a lot of talent.