Porter, who made five appearances for the Shrews during a month-long stay, is likely to return to the squad.
Manager Danny Wilson may want to freshen up his line-up following the goalless home draw with MK Dons last weekend.
On-loan strikers Dominic Poleon and Jonathan Forte are both pushing for recalls after starting on the bench.
Forte, on loan from Southampton, had missed the previous four games due to a groin strain and Leeds forward Poleon started on the bench.
Wilson must decide whether to recall Danny Higginbotham following illness or retain Matt Hill in defence.
Meanwhile, teenage striker Diego De Girolamo could miss the rest of the season after damaging his knee last week playing for Italy Under-18s.
The Blades, unbeaten in their last eight matches, could return to the top of the table with victory if Doncaster lose to Portsmouth.
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- Jonathan Forte