LONDON -- Diego Costa's uncertain future is the only cloud hanging over Antonio Conte and Chelsea halfway through what could be a superb season. Seven points clear at the top of the Premier League, the Blues have every reason to reconcile with their star striker, and many supporters will be heartened to see Costa back in training at Cobham.
Costa's reputation for impulsiveness and emotional volatility was forged in Spain, with many of the most memorable incidents in his nomadic early career documented in Fran Guillen's insightful biography "Diego Costa: The Art of War". Fortunately for Chelsea, many of those incidents also provide evidence that Costa's relationship with the club and Conte could be repaired.