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Ballack has advised Costa to focus on trophies and not his potential earnings
Michael Ballack believes Diego Costa should be more grateful to Chelsea and lead them towards the Premier League title.
The Spanish striker has been strongly linked with a move to China and reportedly went on strike ahead of the club’s trip to Leicester two weeks ago.
Costa has since returned to first team action and scored in his side’s 2-0 win over Hull City to send the Blues eight points clear at the top of the table.