The former Tottenham midfielder has signed permanently for £8 million.
"It was always my priority to secure Jake. Anyone who saw him play last year would know he can only get better," Bruce told the Hull Daily Mail.
"He's come back lean and strong and if he keeps progressing like we all think he can then we'll have a hell of a player on our hands.
"It was a phenomenal first season, really terrific. That was only his first real season.
"He's got all the attributes of a modern day footballer; he's big, he's strong, powerful and handles the ball well. He is the modern day midfield player."
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