Chelsea tried to take Gorre from United when he was 15 but the club held firm.
However, the 18-year-old winger - son of current Scotland Under-17s coach Dean Gorre - did not progress as well as hoped at United.
Hoops boss Neil Lennon confirmed: "We have Kenji Gorre in just now.
"He's been released by Manchester United so we've had him in for a week to have a look at him. He's a winger."