The 20-year-old has been linked with the likes of Manchester United, Manchester City and Arsenal in recent weeks.
“I sincerely hope we can keep Jordan,” Bruce told the Daily Mail.
“However, I am a realist: if one of the giants comes along then we’re up against it. If ridiculous money is offered, it will be difficult.
“I have just been speaking to (Blackburn boss) Big Sam (Allardyce) who has Phil Jones – another huge talent who has done well.
“It is part and parcel of it all that other clubs will have a look. Ultimately we will have to face it and cope with that when it comes.”