Saints have made three changes to their side for Saturday’s visit of winless London Welsh (kick-off 3.15pm).
Alex Waller, Gareth Denman and Lee Dickson are rewarded for impressive cameos from the bench in the 25-20 win against Saracens last time out.
Waller replaces Alex Corbisiero, Denman comes in for Salesi Ma’afu and Dickson continues his rotation with Samoan star Kahn Fotuali’i.
Ben Foden (knee) and George North (concussion) remain sidelined.
Saints know a win will secure a home Aviva Premiership play-off semi-final on May 23.
London Welsh, who have lost all 30 of their games in all competitions this season, name former Saints players Tom May and Koree Britton in their starting 15.
Influential No.8 Chris Hala’ufia misses out due to the ban picked up for striking Leicester’s Laurence Pearce in a recent defeat at Welford Road.
Saints: Tuala; K Pisi, G Pisi, Burrell, Elliott; Myler, Dickson; A Waller, Hartley (c), Denman; Lawes, Day; Wood, Clark, Manoa.
Haywood, Corbisiero, Ma’afu, Dickinson, Fisher, Fotuali’i, Stephenson, Wilson.
London Welsh: Jewell; Awcock, Reynolds, May (c), Elder, Barkley, Rowley, Trevett, Britton, Cooper, West, Corker, Browne, Waters, Fonua.
Replacements: Morris, Aholelei, Gilding, Down, McNally, Liston, Lewis, Robinson.