St Mirren are anxiously awaiting the results of a scan which could rule striker Tony Watt out for the rest of the campaign.
The Buddies are heading into their first ever run of top-six fixtures, having finished on the right side of the split for the first time in Premiership history.
They kick off their remaining five games with a crucial trip to Easter Road to take on Hibs, who currently sit joint-fifth in the table with the Paisley club on 44 points.
The Saints will definitely be without Dundee United loanee Watt this weekend, who picked up an ankle injury in training.
And scans later today will reveal the severity of the knock and whether the influential striker's season is over altogether.
St Mirren boss Stephen Robinson told PA Sport: "We had an injury to Tony Watt in training yesterday so he is not going to be available for Saturday.
"He went over on it. It was innocuous, just two players came together and he went over the wrong way but we are quite concerned about it at the moment
"He is having scans on his ankle today. Obviously we spoke to Dundee United, who own Tony, and we will have the results today and see where we go with it, but we are quite worried about it at the moment.
"Potentially, yes [he could miss the rest of the season]. Obviously it's hard to say without the scans but, on the initial look at it, the medical team weren't too happy with it.
"It reduces our options in the forward areas, with Jonah Ayunga already injured, but we have people who have stepped in and done really well before. Alex Greive, young Lewis Jamieson and Greg Kiltie can play in those areas of the pitch as well.
"It is something we are dealing with and we won't use it as an excuse."
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