Napoli president Aurelio De Laurentiis has warned Jose Callejon and Dries Mertens against leaving for China.

Callejon and Mertens have been heavily linked with moves to the Far East.

“I'm absolutely not prepared to make a major effort for them," he told Sky Sport Italia.

“Each player has a value, depending on where they play, how they play, how old they are and what they do.

“If they want to sell themselves out in China, overpaid to live a life of s*** for two or three years, it's their problem.

“I can't consider China to be competitive. China's far away. If they consider it to be close, it's their problem.

“In life, you have to choose whether to be happy and find a job you enjoy doing or work just for money.

“For me, money is a means and not an end; if it's an end for them then they should go to China."