The pair have struggled for injury and the Cobblers wanted to assess their fitness ahead of pre-season.
Boss Chris Wilder has not ruled out a return for the pair but admitted he cannot offer them anything yet.
“We will talk to those two and we’ve got to assess where they are,” he told the club’s official site.
“We need a fit and healthy team and one of the things I’ve said is that we need a fit robust squad going forward.
“Those two have had their injury problems over the last twelve months but we will speak to them and we might take the option of inviting them back in pre-season.
“At the moment we are not in a position to offer them anything, that might change in the summer but they might have other options as well which we have to respect.”