Career
He was trained by Bobby Rimmer in Manchester for his first eleven professional fights, winning eight on points and two by knockout. He then teamed up with Irish trainer John Breen where he engaged in another four paid contests including a lightweight Central Area title bout where he defeated previously unbeaten joe Elfidh (7-0) by way of knockout in the fifth round. Farrell was managed by Steve Wood for the first two years of his career by switched to Ricky Hatton"s Hatton Promotions in the summer of 2011.
After a short spell with Hatton Promotions, Kieran joined up with promoter Dave Coldwell at Coldwell Promotions.
Farrell was forced to retire from boxing in January 2013 after suffering brain damage during his fight with Anthony Crolla.