An administrative error with paperwork saw AC Milan submit their final Champions League spot without the name of young French striker, M'Baye Niang.
UEFA regulations meant precocious star, Stephan El Sharaawy was eligible for registration under the B List.
However, Milan director, Umberto Gandini, has been forced to apologise after submitting El Sharaawy's name using the last A List position, at the unfortunate expense of Niang.
"Umberto Gandini, director of the AC Milan organisation, assumes the responsibility for the error in the compilation of the Champions League lists for not having taken into account in the drafting of such legislation that UEFA allows the inclusion of players born after January 1, 1992 with at least two years of experience at the club between the ages of 15 and 21 in the B List," read an official club statement.
Should AC Milan fail to qualify from a group containing Barcelona, Ajax and Celtic, Gandini's error will have cost the young forward a full season of European football.
Milan begins its title attack against Celtic on September 18.
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