Motu Tony has also left Castleford for Hull
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Hull have made second-rower Jamie Thackray their second signing in four days from relegated Castleford.
The 24-year-old, who rejected another unnamed Super League club, will link up with former Tigers team-mate Motu Tony, who signed for Hull on Monday.
The former Halifax player has only signed a one-year deal because he has not played since May due to a broken arm and needs to prove his fitness.
Hull are also tipped to land a third Tigers player in prop Andy Lynch.
Thackray said: "I have only signed for one year because I realise I have to prove I have recovered from this injury.
"I felt a one-year deal was fair to myself and the club and I am delighted to be coming to Hull who I believe are a club on the up and will win honours.
"In fact, I am so convinced of that I turned down a better offer from another Super League club to come to the KC."