Chelsea have included a buy-back clause in Nathaniel Chalobah's sale to Watford.

The London Evening Standard says the Blues also stand to profit should the Hornets sell Chalobah elsewhere as they have negotiated a sell-on fee.

Chelsea wanted to hand the 22-year-old a new contract but as first revealed last month, the midfielder was looking to leave after making just 15 appearances last term.

Chalobah has joined Watford for £5.5million.

He had only one-year left on his current contract and Watford are believe to be thrilled at getting such a bargain.