The 20-year-old has been strongly linked with clubs such as Manchester United, Manchester City and Chelsea.
“It is wonderful that Jordan is playing for England – he deserves it,” Bruce told the Daily Express. “Make no mistake – he is that good.
“Everything about him is right. He is full of endeavour, young, hungry and the archetypal modern-day footballer – 6ft 2in and yet a marvellous athlete. He is also a level-headed kid, which makes him a pleasure to work with.
“Put all these qualities together and he is courted by all the top clubs.
“It is my problem and, now he is also playing for England, it is going to be so hard to keep him at Sunderland, but I will try. It will be a fight, though.
“Why would you want to sell him for anything less than £25million?”
