Kellyman moves to Cardiff on a season-long loan.
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He becomes the Bluebirds third signing of the summer window, following the recruits of goalkeeper Nathan Trott and defender Gabriel Osho in South Wales.
Kellyman said: "I'm happy to be here. I can’t wait to get started.
“I like to make things happen. I like to be forward thinking and get on the ball as much as possible. I want to come here, get some goals and assists and help the team.
"I've been watching the recent games and it's been great to see the exciting players we already have. I'm looking forward to playing with the lads."