Chelsea management are becoming concerned over Thibaut Courtois delaying new contract talks.

The Sun says the champions face forking out £10million a year to keep their goalkeeper.

Talks about a new deal have broken down over pay and Courtois will now wait until the last minute before committing his future to the champions.

Courtois wants to know how much Chelsea are willing to give transfer target Romelu Lukaku and current team-mate Eden Hazard — and will then demand parity with his fellow Belgians.

Courtois has two seasons left on his current £80,000-a-week terms.

But the 25-year-old knows that as one of the most in-demand keepers in the world he can squeeze more cash out of the champions.