Steve Bruce accepts his move for Connor Wickham carries an element of risk, but has backed the striker to make his mark with Sunderland.
The Black Cats paid Ipswich an initial £8.1million for the 18-year-old, and could eventually have to fork out as much as £12million for a player who is yet to kick a ball in the Premier League.
However, Bruce is confident Wickham will prove an astute signing if he fulfils his rich potential.
"He's got bags and bags of potential," he told the Sunderland Echo.
"When you are buying potential, of course there's always a risk. But I'm convinced that he's going to be a top player.
"He provides something different. He's 6'3" at 18 - you have to remember he's 18. But I'm convinced he will be a fantastic signing for Sunderland.
"I flew Connor and his dad out to Portugal a couple of weeks ago and laid down what we planned for him.
"He thought this was the best stage of his development to come here, feature and play. That was the big thing for him, the chance to play frequently.
"He's got a good chance here with us."