Both players are suffering from food poisoning and have been ruled out of the match at Ibrox.
Madjid Bougherra has failed to recover from a knee injury, meaning teenager Danny Wilson is set to make his home debut.
Steven Whittaker and Kevin Thomson are both expected to be fit for the game despite missing training on Friday morning, while Pedro Mendes, Kirk Broadfoot and Maurice Edu remain on the sidelines.
Rangers (from): McGregor, Whittaker, Papac, Weir, Davis, McCulloch, Fleck, Naismith, Lafferty, Miller, Novo, Boyd, Beasley, Loy, Wilson, Rothen, Alexander, McMillan.
