The Blackburn player made his debut in England's 3-0 friendly win in Trinidad & Tobago on Sunday but he was the seventh substitute used in the game by Fabio Cappello when the rules only permit six.
The England camp claim that they had special dispensation to use seven substitutes and with no complaints from Trinidad & Tobago's FA, FIFA have agreed to let the match stand as a full international and those players including Warnock who played allowed to keep their caps for this game.
Former City youngster Iysden Christie is set to join Stevenage Borough. The Coventry born striker has rejected a deal offered by Kidderminster Harriers.
Ben Mackey has joined Brackley Town. The former City youngster had been playing for Leamington FC.
Gary Montgomery, has signed a one year extension deal to his contract at Grimsby Town.