The 19-year-old has found opportunities limited at Ibrox this term, but caught the attention of fans by scoring against Porto in the Champions League – the goal which sent the Gers into the last eight of the competition.
He told the Scottish Sun: "I'm really excited with the move and I'm going down there to score a few goals and to get some regular football.
"I got frustrated on the bench and I didn’t think the chance was going to come this season.
"So I thought this would be the time to go out and get some experience. But after that I'll be back up at Rangers."