Murray on bench for injury-hit Stags
He also took the gamble of pushing Ricky Ravenhill back into the side early after he hurt his hamstring in the warm-up last weekend.
However, Leicester loanee Callum Elder missed out with a calf injury so youngster Jack Thomas was given a full debut as one of four changes.
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Hide AdInjured defender Michael Raynes was replaced by Martin Riley.
Out also went Matt Rhead, Jamie McGuire, both dropped to the bench. Recalled on the wing was Junior Brown.
STAGS: Pidgeley, Sutton, Riley, Tafazolli, Ravenhill, Heslop, Lambe, Beevers, Thomas, Brown, Oliver. Subs: Studer, Rhead, Binham, McGuire, Marsden, Murray, Kee.
NORTHAMPTON: Duke, Moloney, Horwood, Collins, Richards, O’Toole, D’Ath, Taylor, Byrom, Holmes, Cresswell. Subs: Carter, Bodin, Hackett, Tozer, Snedker, Toney, Newey.
REFEREE: Lee Collins of Surrey.