Danny Higginbotham has hailed the quality of his Sunderland team-mate Kenwyne Jones.
The pair spent time together at Southampton, when front man Jones was still maturing.
Roy Keane splashed out £6 million to prise the 23-year-old striker away from St Mary's in the summer.
And having seen Jones score three goals in six Premier League games since their reunion, Higginbotham has reflected on the change.
"Kenwyne always had raw talent but he has come on leaps and bounds," Higginbotham told the Sun.
"I remember him being enthusiastic with an athletic build and speed, but he has put it all together over the last year and is a real threat.
"There is no comparison between how he plays now and how he played then.
"I play against him in training and know that he is big, strong and powerful - a handful for anyone.
"He is still laid back but will work as hard as anyone and now he's at a huge club with coaches and a manager around to help him develop."
Jones was a real handful in the 3-1 defeat at West Ham United on Sunday, and will hope to make a similar impact when Sunderland welcome Fulham next in the league at the weekend.