Chelsea risks losing manager Antonio Conte if it cannot keep hold of three crucial players this summer, according to reports.
Costa, the unpredictable Spaniard, caused controversy when he reportedly fell out with Conte during the January transfer window and threatened to leave for China. Hazard and Courtois, meanwhile, are both said to be attracting interest from Spanish giant Real Madrid.
According to ESPN, Italian club Inter Milan is keen to bring Conte back to his homeland this summer, with its Chinese owners offering a giant treasure chest of transfer funds.
This weekend, his team hosts Crystal Palace at Stamford Bridge as it looks to retain its 10-point lead at the top of the table.
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