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Spotted: Key men absent from Chelsea training while Costa works hard amid China rumours
DIEGO COSTA is seen putting in a shift during Chelsea training on Friday, but two key players were missing as the Blues prepare to take on Middlesbrough.
Chelsea were missing a key player as they trained ahead of their clash with Middlesbrough
Antonio Conte kept a close eye on his Chelsea players as they were put through their paces at Cobham, although the Italian may have to do without two key stars against Middlesbrough on Monday.
The Blues have enjoyed very few injury problems this season, but their squad depth will be tested after Conte highlighted a couple of fitness issues ahead of Boro's visit.
Scroll through the gallery above to see the best pictures from Chelsea's latest training sessions, with two key Blues stars absent.