The duo were absent on Tuesday night when the Shrimps produced a Capital One Cup shock by beating Wolves 1-0 with McCready carrying a troublesome ankle problem and Marshall hampered by a hamstring strain.
Forward Kevin Ellison is also carrying a hamstring injury and will miss at least another week.
He joins long-term absentee Jack Redshaw (hip) on the sidelines with last year's top scorer unlikely to return until the new year.
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- Disease & Medical Conditions