Diego Costa was once again the talking point as Chelsea extended their unbeaten run at the top of the Barclays Premier League table. But it wasn't for the usual goal scoring reasons as the Blues were held to a 0-0 draw by a stubborn Sunderland side at the Stadium of Light. Costa instead was the centre of attention following two incidents which could have led to the dismissal of the Spanish striker in the North East. VIDEO Scroll down for Sportsmail's Big Match Stats: Sunderland 0-0 Chelsea Diego Costa of Chelsea (right) catches Sunderland's Wes Brown with an arm while battling for a header during the second half
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Diego Costa was booked during Chelsea's 0-0 Premier League draw at Sunderland at Stadium of Light
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Spanish striker was involved in controversial incidents in both halves with John O'Shea and Wes Brown
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Costa was booked after using his arm in aerial tussle with Brown but could have seen red card during clash
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Former Chelsea star Ruud Gullit admits Blues striker was lucky to get away with it
Costa had earlier been involved with a clash involving @placeholder with the striker appearing to kick out at the defender following a tackle