Sampson is on the lookout for a replacement for Peter Gilbert, who left last week to join Southend.
Town will field two different XIs so youth-teamer Charlie Death is likely to play one half with a trialist playing the other.
"I'm sure we'll find someone," Sampson told the Northampton Chronicle.
"If I haven't got somebody in by Saturday then Charlie Death from the youth team can fill in for us at left-back.
"He's been training with the first team anyway, but we might well have a trialist on board by then. You get rid of one and all of a sudden you're inundated with people ringing you up about left-backs, but it will be about getting the right one at the right price."