Kevin Stewart was frustrated at the lack of game-time at Liverpool and feels Hull will help him to "progress to the next level".
The 23-year-old has vowed to prove that the Tigers were wise to part with £4m (could rise to £8m) in order to sign him.
The highly rated defensive midfielder joined Liverpool in 2014, and subsequently spent time on loan with Cheltenham, Burton and Swindon, before signing a three-year deal with Hull last week.
Stewart told the Hull Daily Mail: "I didn't feel as though I could risk staying at Liverpool for another year and just play five to 10 games.
"That wouldn't have been enough for me if I want to progress and go to the next level. That's what I can do here.
"I think this is the safer and better option for my career.
"I've found myself getting frustrated at Liverpool.
"I had some great times there and I don't regret it but it feels as though I've left at just the right time. Liverpool gave me a great platform to get this move."
Hull have never spent so much money on a player when outside of the Premier League and Stewart added: "I was very, very flattered when I heard that. I'll definitely pay that back with work rate for sure and look to show what I can do.
"My agent called up when I was on tour with Liverpool and said that Hull had put in a bid. I was really excited for the opportunity as soon as I heard about it.
"I knew I needed to get out and play games, especially at this stage. I need to start my career and can do that here."