St Johnstone manager Callum Davidson will assess players who are carrying knocks and niggles ahead of the cinch Premiership clash with Dundee United.
Some players could be taken out of the team as a precaution with Thursday's second leg against LASK to follow.
David Wotherspoon is due to get out of self-isolation but Sunday's game may come too soon for him to start.
Wales and Manchester United midfielder Dylan Levitt could feature for the visitors after moving to Tannadice on loan.
Louis Appere is pushing for a comeback for United.
Long-term absentees Mark Connolly and Declan Glass (both knee) remain out.
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