Kellyman is set to move to the Bluebirds on a season-long loan.
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The midfielder joined Chelsea a year ago from Aston Villa, but struggled with hamstring injuries last season.
Kellyman, 19, has been restricted to just four appearances with Chelsea's U21 team and is yet to make his senior debut.
He is eager to see the Cardiff happen, confident League One will grant him the platform to play consistent football, says BBC Sport.