Central midfielder Kamara was a regular for the Gunners' under-21s last season too, featuring 10 times. The tough-tackling 18-year old is a Finland youth international.
Moore, who turned 17 on Saturday, made eight appearances for the Gunners' second string in 2013/14. An England youth international, the right back won the European Under-17 Championship with the Three Lions this summer.
Vickers, 18, put in a string of fine performances in the FA Youth Cup last season, including a man-of-the-match display against Charlton Athletic in the fifth round.
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