Boss Brian McDermott told his club's official website: "We are delighted to have signed Connor until the end of the season.
"There was a lot of competition for his signature, but he was very keen to come and play at Leeds United.
"He is another young English player who has everything in front of him."
The England U21 international said: "I need to be playing football. Once I heard Leeds were interested in signing me there were no other choices and no doubt I wanted to come.
"The potential here is big. There are some players here that I know already, and the team is looking to push towards the play-offs. Hopefully I can help with that."
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