Solomon becomes the sixth Blues player on international duty after the selections of teammates David Cotterill, Jonathan Spector, Jacques Maghoma, Demarai Gray and Reece Brown.
The 19-year-old will train with Super Eagles as he aims for inclusion in the squad for the Olympic Games in Rio next summer.
Solomon made his debut for Blues first-team only two weeks ago, coming on as a substitute in the 2-0 win against Gillingham in the Capital One Cup.
The London-born youngster, who has drawn comparisons with fellow Birmingham winger Gray, is eligible for Nigeria through his parents.
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