"I'm always willing to be open-minded. I have opinions about things, but I don't bear grudges," Boothroyd told the Watford Observer.
"We expect a certain level of discipline here and it's important the players do what is asked of them. I always want to be flexible and it's a clean slate for Will.
"He's a very clever player and he'll open up defences. He's bright, got a bit to prove and I like them to be hungry.
"I see him as player who can play in the little pockets, in from wide or just off a frontman. When a game is stretched, he can get on the ball and pick out passes."