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Bentaleb we signed at about aged 16, maybe 17 tops, first saw him on trial at a youth tournament.
Reality is plenty of kids most round between academies up to the age of about 16, so its a bit crazy saying X joining an academy at 12 is different from one joining at 14 or 16, they've all been trained elsewhere for a while, often from the age of 8.
For ease I stick to the UEFA definition of a Club Trained player as its an objective definition which has a practical meaning for the squads of all clubs.
I thought Bentaleb signed for us in 2012? He was 17 minimum.