Winger Hoilett limped off against Birmingham on Saturday with a slight hamstring problem and striker Johnson missed the 1-0 win over his old club with a knee injury.
Matt Phillips came on for his Rangers debut in Hoilett's place having recovered from a broken arm so he could start.
Benoit Assou-Ekotto was on the bench following his move from Tottenham and will be pushing to make his debut but fellow deadline-day signing Niko Kranjcar is expected to miss out again with a groin problem.
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- Matt Phillips