Chelsea must dig deep in their coffers to keep Eden Hazard at Stamford Bridge.

That is according to club legend Michael Ballack.

Hazard, who is out of contract in 18 months time, has been linked heavily with Real Madrid. But Ballack believes they can keep the Belgian in London.

"You have to pay him a lot of money!" Ballack told Goal. "But more importantly, you have to give him a vision.

"You have to tell him how important he is, ask him what he wants from the club and to give him a little bit more responsibility.

"You need to find out what he wants as well, ask him if he's happy. Of course, you want to win something and be as successful as possible as an individual player. It is normal to look around and think, 'With what club can I achieve that with?'"