The winger with explosive pace joins Lee Johnson's side ahead of today's Yorkshire derby and will wear the number 27 shirt.
Speaking of the 22-year-old, Head Coach Lee Johnson said, "He's a good player and a player myself and Tommy Wright have been trying to get hold of for a while.
"He's in a very big squad at Cardiff and found opportunities limited but whenever he's played, he's done well.
"We believe in him as a footballer and we felt it was right to bring him in.
"He's very, very quick and very direct. He gives you that threat from out wide. He can get crosses in the box and it will compliment what we've got in Sam Winnall, Conor Wilkinson and Marley Watkins up front.
"Ideally we wouldn't have six loans, we know that, but it's fair to say we were chasing our main target - who was a winger - that we didn't quite get through no fault of our own and we've acted really, really quickly to bring in a good player.
"We've still got the potential to turn a couple of our loan signings into permanents and that's something we will look into."
