Samoan full-back Ahsee Tuala will make his Saints debut in Saturday’s LV= Cup clash with Wasps at Franklin’s Gardens.
Tuala arrived earlier this week as injury cover for Ben Foden, who has been ruled out for the rest of the season with a knee injury.
And the 25-year-old, who had been strutting his stuff for Counties Manukau in New Zealand’s ITM Cup, is thrown straight in at 15.
Scotland lock Tom Ryder made his Saints debut in the 17-8 defeat at Leicester last weekend and he makes his Gardens bow this Saturday.
England prop Alex Corbisiero, who was released by his country ahead of the Six Nations opener in Wales, also starts.
Lock James Craig returns from a spell on the sidelines, while Ken Pisi, Kahn Fotuali’i and Sam Dickinson are also back to add some vital experience.
If Saints are to qualify for the semi-finals, they need to beat Wasps with a bonus point and hope Leicester deprive Cardiff Blues of a point in the Welsh capital.
Wasps need the opposite outcome and they have the likes of Andy Goode and Nathan Hughes on their bench if needed.
Saints: Tuala; K Pisi, Waldouck, Stephenson, Elliott; Olver, Fotuali’i; Corbisiero, Williams, Denman; Ryder, Craig; Dowson (c), Harrison, Dickinson.
Replacements: Haywood, E Waller, Ma’afu, Woolford, Nutley, A Day, Hooley, G Pisi.
Wasps: Miller; Bassett, Daly, Helu, Varndell; Lozowski, Gash; Yapp, Lindsay, Taylor; Rowlands, Cannon; Jackson (c), Young, Thompson.
Replacements: Festuccia, McIntyre, Cooper-Wooley, Myall, N Hughes, Goode, G Hughes, Eastwell.