The 20-year-old, who moved to Stamford Bridge a year ago, pulled out of the African Nations Cup qualifier against Uganda three weeks ago citing a hamstring injury and Chelsea confirmed the player was undergoing treatment in London in a letter to the Nigerian Football Association - but failed to release him for independent assessment by Nigeria´s doctors.
NFA spokesman Ademola Olajire said on www.bbc.co.uk today: "Mikel´s gross act of indiscipline and lack of commitment towards national call-ups is totally unacceptable.
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