Marc Richards will be assessed by Northampton after the striker missed their 2-1 win at Shrewsbury on Saturday.
The striker sat out with an Achilles problem but boss Chris Wilder is hopeful he will be available to face Portsmouth.
"We made a decision on Friday, he could have played but we did not want to run the risk of him missing a few game afterwards," he told Northampton Player.
Ivan Toney stands by to deputise again while John-Joe O'Toole remains suspended.
Wes Fogden could make his first appearance...