New Rangers signing Olwethu Makhanya could miss the Europa League tie against Jagiellonia Bialystok due to a visa issue.
Ibrox boss Derek McInnes admitted the centre-back might be unavailable for the Poland trip due to red tape over entry into the country.
Rangers are set to face Jagiellonia in Thursday night's third qualifying round first leg.
McInnes also revealed other squad concerns.
Ben Godfrey, who debuted in the 1-1 draw against Dundee United, was forced off with a hamstring issue.
Ross McCrorie is managing a knee complaint.
McInnes told Sky Sports: "He [Godfrey] felt his hamstring tighten up, he was with the physio and the doctor there before I came in.
"That would be a natural concern; we are not overly blessed with defenders, as you could see.
"Makhanya, who we have signed, still has a potential to maybe be a risk for getting a visa for Poland for the away game.
"And Ross McCrorie has been struggling a wee bit with a knee complaint.
"We don't have our troubles to seek on that side of it, so it's something we might need to address."
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