Hearts could be without Peter Haring for their Ladbrokes Premiership meeting with Rangers on Saturday.
The Austrian midfielder shook off a groin injury to face Inverness in last weekend's William Hill Scottish Cup semi-final but the problem has resurfaced.
Full-backs Ben Garuccio and Demetri Mitchell and forward Steven Naismith are all out with knee injuries.
Aidan Keena and Callumn Morrison are also out for the same reason.
Provisional Hearts squad: Zlamal, Smith, Godinho, Brandon, Berra, Souttar, Shaughnessy, Burns, Mulraney, Bozanic, Djoum, Lee, Clare, Haring, Ikpeazu, Wighton, MacLean, Vanecek, Doyle.
Ryan Kent and Alfredo Morelos are still suspended for Rangers
Defenders Joe Worrall and Borna Barisic are fit again following knee and hamstring problems respectively.
Long-term absentees Jamie Murphy and Graham Dorrans (both knee) are continuing their rehabilitation work.
Provisional Rangers squad: McGregor, Tavernier, Halliday, Barisic, Flanagan, Goldson, Katic, Worrall, McCrorie, Kamara, Jack, Arfield, Coulibaly, Davis, Candeias, Defoe, Lafferty, McAuley, Grezda, Foderingham.
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