George Elokobi looks set to make his Bristol City bow when Leeds visit Ashton Gate.
The full-back made a three-month loan switch from fellow npower Championship side Wolves on Wednesday.
Manager Derek McInnes acquired Elokobi after Greg Cunningham was ruled out for two months with a ruptured ankle tendon.
Teenager Joe Bryan deputised in the 2-2 draw with Watford last weekend but McInnes was keen to bring in a more experienced option in Elokobi.
McInnes' only other absentee is midfielder Cole Skuse, who continues to miss out following a nasty challenge with Nathaniel Mendez-Laing.
The Robins boss revealed other members of his squad had one or two knocks to contend with, but nothing which is likely to rule them out of the clash with Neil Warnock's side.
Leeds skipper Lee Peltier and Paddy Kenny could both return to the squad after missing the midweek Capital One Cup win over Everton.
Peltier hurt his ankle in last weekend's win over Nottingham Forest, while goalkeeper Kenny injured his groin in the same match and neither were risked on Tuesday night.
Teenager Sam Byram dropped back into defence in Peltier's absence and Jamie Ashdown made his second start for the club in place of Kenny.
Striker Luciano Becchio is also nursing an ankle injury, but lasted the full 90 minutes against Everton and is expected to continue.
The versatile Danny Pugh and midfielder Michael Brown returned to the starting line-up in midweek and will be hoping to retain their places, while teenage striker Dominic Poleon, defender Adam Drury and forwards Luke Varney and Andy Gray are all pushing for recalls.
Striker Ross McCormack (ankle), plus midfielders David Norris (thigh) and Paul Green (knee) remain sidelined.