Connor Coghill: Doncaster-trained boxer in hospital with bleed on the brain
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Posting on social media, Bull wrote: "We are saddened to confirm Connor is currently in hospital under observation after a scan has discovered a bleed on his brain.
"Connor has had headaches since his boxing contest last week in Sheffield.
"Obviously it's devastating news for Connor as boxing has been his life since a young age.
"He's stable and resting and wanting people to respect his time during this difficult period."
Coghill, 28, was cornered by Bull, who also manages his career, and stablemate Jason Cunningham, from Woodlands, against Price.
He was floored four times in a back-and-forth contest before being stopped in the twelfth and final round.