The Hampshire-based official has already taken charge of one Blues fixture's this season - he was the the referee for Blues first game of the campaign against Fulham on 13th August. Matthew Upson and Stephen Clemence were both booked during the 0-0 draw at Craven Cottage.
Mr Styles has also taken charge of one Everton game this season, that being for their 1-0 home defeat to Wigan Athletic on 24th September. Duncan Ferguson and Simon Davies were both booked on that occasion.
In total Rob Styles has taken charge of 12 league and cup games so far this season in which he has handed out 32 yellow cards and 1 red.
Mr M Cairns and Mr J Holbrook will be Rob Styles' assistants for the game at St Andrew's on Saturday afternoon.