McMahon sat out a two-game ban after reaching 10 yellow cards for the season and Morgan must decide whether to put him straight back in at right-back in place of Matt Hill.
Morgan has recalled Jordan Chappell from his loan spell at Torquay. The young winger played regularly for Morgan in the Blades Under-21s side and could make his first senior league appearance for the club.
Teenager Callum McFadzean is still pushing for his first start after another substitute's appearance in the home defeat to Crawley on Tuesday and fellow midfielder Barry Robson could also return.
The Blades, who have no other new injury or suspension worries, are chasing their first win in four matches as they look to close the gap on the top two.
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- Jordan Chappell