Koke is currently in high demand following his excellent performances for Atletico Madrid this season.Reuters

Chelsea reportedly have to fork out a whopping £50 million if they want to land Atletico Madrid's in-demand midfielder Koke this summer.

The 22-year-old midfielder, who is expected to be the next big name in Spanish football, has been the target of a number of clubs for quite some time following his excellent performances at Atletico Madrid.

Manchester United and Barcelona were being linked with a move for the midfielder last summer, but a transfer failed to materialise and the midfielder ended up signing a new five-year deal with a reported £50 million buyout clause.

Chelsea were believed to be keen on landing Koke in the January transfer window, but they too failed to sign him and he ended up remaining at Atletico.

The Blues are reportedly ready to rekindle their interest in the 22-year-old this summer, but, according to the Daily Mirror, Atletico are not willing to settle for anything less than the £50 million buyout clause in the midfielder's current contract, which expires in 2019.

However, it is believed that Atletico will be willing to negotiate their asking price for Koke if Chelsea include left-back Filipe Luis in the deal.

Luis, who only completed a £15 million switch from Atletico Madrid to Chelsea last summer, has been unable to get regular first team football this season due to Blues boss Jose Mourinho's preference for Cesar Azpilicueta in the left-back position.

Although the Brazilian has claimed that he is happy with his current role at Chelsea, he may be open to a return to his former club, where he managed to find a lot of success.

Meanwhile, Chelsea boss Jose Mourinho feels that Eden Hazard is currently one of the best three players in the world alongside Barcelona's Lionel Messi and Real Madrid's Cristiano Ronaldo.

The 24-year-old, who has been in excellent form at Chelsea this season, scored the only goal against Manchester United on Sunday, to push the Blues closer to their first Premier League title five years.

And Mourinho claims that Hazard, who is the favourite to win the PFA Player of the Year this season, is currently among the top-three players in the world.

"He's a kid, but he is also a family man and he knows he is one of the three best players in the world, responsibility comes with that and he is coping with that –responsibility," the Portuguese said.

"If people want to be fair, he gets that award. But the award I want him to win is the Premier League. I've had lots of stars, but he's the humble star. He's a great kid."