The 28-year-old midfielder, who had a successful season on loan at Maine Road last season, collapsed during Cameroon’s Confederations Cup match with Columbia and despite the efforts of the medics could not be revived.
His loss will be keenly felt not just by Blues fans and his club Lyon, but by football fans the world over.
To honour Marc, we have opened a book of condolence where you can look at the tributes from others and add your own.
Read the tributes and add your own here.
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