Notoriously feisty Chelsea forward Diego Costa has been praised for his cool head under pressure this season, with teammate Thibaut Courtois admitting the Spain international has improved the mental side of his game this season. Costa earned a reputation for theatrics and a quick temper in his first two seasons in England, but has appeared more focused on his game during the current campaign - although the last couple of weeks have seen some old habits begin to kick back in. Somewhere in the...
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