John Lundstram will be sent for a scan on his ankle after limping off against Ross County.
The midfielder - who has been a key player under Michael Beale - was forced off injured in the first half at Ibrox.
Now, Lundstram will have a scan to identify the issue after rolling his ankle when attempting to block a shot.
"It destabilised us today," said Beale of the injury problem for Lundstram.
"John is really important to our structure. He was fantastic in midweek.
"He's gone to block a shot and he's rolled his ankle. It looks like quite a nasty one.
"We will take a scan on that and update after 24 hours."
Beale pinpointed Lundstram's enforced sub as a key moment in the match as he admitted it might have inadvertently contributed to the opening goal but also thrown off the balance in his side.
The Ibrox boss added: "I think that moment was quite a big moment in the game. We ended up playing with three number tens and two nines.
"That's what probably forced the first goal and probably made the game a bit more end-to-end for my liking.
"It was one of those days, I thought it was a performance at the end of a three-game week, that's probably how I would leave it.
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