He endured a frustrating campaign on loan last season with Wolves, making just seven appearances for the Championship side as he was forced to return to the Man United reserves side to pick up game time.
Leeds have monitored Borthwick-Jackson for the past month and decided to move for him as United agreed his temporary exit.
On Borthwick-Jackson, Leeds coach Thomas Christiansen said: “I’ve seen him a few times. He’s a very good player and homegrown which is very important.”
Here’s what Paul Lambert had to say about leaving Borthwick-Jackson out when he took over from the sacked Walter Zenga as coach in November.
“Cameron’s obviously on loan here and hasn’t really featured under me, just because I felt we needed a bit more experience,” he said.
“He’s a young lad, a tidy and nice footballer and he’s got to fight his way to get into the side. But he never lets himself down in training. He trains well.”
It’s clear he still needs some more time to develop, but Borthwick-Jackson can’t afford to have another bad loan spell if he wants to prove there is a place for him at Man United.