Chelsea could face a battle to keep Eden Hazard and Diego Costa at Stamford Bridge as reports claim Real Madrid are lining up a double swoop.

New coach Rafa Benitez is planning a bumper spending spree after the Spanish giants finished last season trophyless and the Chelsea duo are said to be high on his wanted list.

Hazard and Costa were instrumental as Chelsea won the Premier League last season and there is no way Jose Mourinho will entertain the idea of selling them to his old club.

However that may not stop Los Blancos from testing the water with what would have to be an astronomical double bid.

Hazard has been linked with the capital giants for some time but only recently penned a new deal, while Benitez may have been alerted to the recent reports that Costa is unsettled in England.

Even so Mourinho does not seem concerned about losing any of his key players.

“I don’t see our team losing players,” he said. “I don’t see our team losing our qualities, especially our mental, emotional approach to matches, to the season, to the competition.”

Instead, Mourinho claims he is looking to add “two or three” players to his squad.

He added: “It will be difficult to find players to go straight into the team. Because it’s not easy to find a better striker than Diego [Costa], a better keeper than [Thibaut] Courtois, a better midfield player than [Nemanja] Matic or [Cesc] Fabregas.”

Chelsea are priced at 2.38 to win the Premier League again next season but their chances would be severely hampered if Costa and Hazard moved on.