By Chelsea correspondent Tony Hughes

Papy Djilobdji will undergo a Chelsea medical after agreeing to join the Premier League champions, Football Insider sources understand.

The 26-year-old cenre-back is heading for the London club’s Cobham training base after agreeing the terms of four-year contract with the Premier League club.

Chelsea have agreed to pay £2.8million for the Nantes player, who only has a year remaining on his current deal with the French club.

The move for Djilobodji comes as Jose Mourinho accepts defeat in his summer-long pursuit of Everton defender John Stones.

The west Londoners made a series of bids for Stones, who also handed in a transfer request last week to smooth through a transfer to Stamford Bridge, but the Merseysiders refused to offload the England international.

Chelsea turned their attention to Djilobodji, a Senegal international, after Mourinho made it clear that he wanted to bolster the team’s defence.

The champions have endured a calamitous start to the season, losing two of their opening four matches and shipping eight goals in the process.

Djilobodji has made 183 appearances for Nantes and has also been awarded 12 caps for the Senegal national team.