Biggar's back as Saints square up to unbeaten Leinster
Biggar, who is currently the top points scorer in this season's Champions Cup, was forced to withdraw from the team that beat Leicester Tigers 36-13 last weekend due to a foot injury.
But he is back at 10 for the game against the unbeaten Irish giants, replacing James Grayson, who is named among the replacements.
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Hide AdAhsee Tuala will make only his second start of the season as he comes in for George Furbank, who took two blows to the head against Tigers.
The only other change comes in the pack, where Jamie Gibson starts at seven, replacing Lewis Ludlam, who is on the bench.
Piers Francis is also among the replacements after recovering from the shoulder injury he sustained during the first half of the win against Lyon last month.
But Courtney Lawes (hamstring), Owen Franks (thumb), David Ribbans (back), Alex Mitchell (knee), Henry Taylor (thumb), Harry Mallinder (knee), Ben Franks (elbow), Reece Marshall (hamstring) and James Fish (head) are all still sidelined.
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Hide AdLeinster don't have such an injury list to contend with and they are able to bring back their international stars after resting them for the win at Glasgow Warriors last weekend.
Jonny Sexton skippers a star-studded side from fly-half.
Saints: Tuala; Collins, Proctor, Hutchinson, Naiyaravoro; Biggar, Reinach; Waller (cc), Haywood, Painter; Moon, Ratuniyarawa; Wood, Gibson, Harrison (cc).
Replacements: van Vuuren, van Wyk, Hill, Coles, Ludlam, Tupai, Grayson, Francis.
Leinster: Larmour; D Kearney, Ringrose, Henshaw, Lowe; Sexton (c), Gibson-Park; Healy, Kelleher, Porter; Toney, Ryan; Ruddock, van der Flier, Doris.
Replacements: Tracy, E Byrne, Furlong, Fardy, Deegan, McGrath, R Byrne, R Kearney.