CELTIC manager Ange Postecoglou is unsure if Giorgos Giakoumakis or David Turnbull will be fit in time for Sunday's Scottish Cup semi-final with Rangers.
The two Glasgow rivals will meet for the fourth time this season at the weekend and know that a victory will tee up a Hampden final against either Hibernian or Hearts.
Postecoglou's side have won both derbies since the turn of the year - including a 2-1 victory at Ibrox earlier this year - and also lead their Old Firm rivals in the Premiership by six points with five games left to play.
Greek centre-forward Giakoumakis started Saturday's 7-0 rout of St Johnstone but had to be brought off during the first half after sustaining an injury, while midfielder David Turnbull was also left requiring medical attention at one stage.
Speaking to Celtic TV, Postecoglou admitted that he is still awaiting the results of a scan to determine the pair's fitness.
"[There is] Nothing concrete yet," the Celic boss said. "Again, we're still waiting on the final scans on it.
"Hopefully it's not too bad. He [Giakoumakis] feels like it's not too bad. But until we get the information we won't know.
"Similar with David Turnbull, he obviously got a pretty hard knock. It's only a couple of days after so we'll see how it all settles down.
"With both, I'm hoping it's not too lengthy an absence."
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