Fleming missed last weekend's dramatic 2-1 comeback victory at Dagenham after picking up an ankle injury in the goalless draw with Cheltenham at the Globe Arena.
Fellow midfielder Ryan Williams is pushing for a start after scoring twice in three substitute appearances, including the winner against the Daggers last time out.
Left-back Robbie Threlfall is Bentley's only injury concern due to a reoccurrence of the thigh injury that has seen him miss several games this season.
"We're under no illusions, it's going to be a very tough game," Shrimps goalkeeper Barry Roche told Press Association Sport.
"They're a tough outfit to beat.
"But with the way we're playing and the confidence we've generated over the past month, we don't fear anybody. We'll respect every team but we certainly won't fear them."
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- Robbie Threlfall