Willock came off the bench today to score the winner in victory over West Ham today.
The midfielder is on-loan from Arsenal and Bruce said: "We would love to keep him here. He is the type of player you'd love to build your club around. Whether we can or not I'm not quite sure."
He added: "I think that's (Allan) Saint-Maximin's 12th start of the season and the injuries we've picked up to our defenders. We've been too long without our big players but I always said with our big players, we'd be OK and hopefully that's what it is."