The 20-year-old left-back had a difficult time on loan at Wolverhampton Wanderers last season, making just six Championship games before returning to Manchester United.
He is looking to get back on track at Elland Road as he is highly regarded by coaches at Old Trafford but just needs more competitive games to excel his development.
Borthwick-Jackson made 14 appearances under Louis Van Gaal in his breakthrough season which is why new Leeds boss Thomas Christiansen believes he can bring balance to his side.
They start their new season newly-promoted Bolton Wanderers on Sunday and Borthwick-Jackson will be hoping to make his mark on the side.
Especially after last season, he’ll be cautious of falling behind and although he was unlucky with the position of Wolves, it seems like he has everything in place to progress at Leeds.
Mourinho has previously backed him to have a big future at United, but it’s just about picking up game time and trying to progress away from the club before he’s able to come back and slot into the team.