Defender Gary Warren has a hand injury but it will not prevent him taking to the field.
Caley Thistle have yet to concede a goal this season after winning all three matches.
Arsenal match on Pellegrini's mind
Stats: United may not be down-and-out
'The man who must replace Moyes at United'
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Fury as stars punished for Mandela tributes
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Burglar caught on camera as victim slept