Northampton will need to overcome the testing rigours of a five-day turnaround when they resume Heineken Cup business in France on Friday.
Saints head to the Stade Ernest Wallon in Toulouse, where Pool Four rivals Castres await them. While Castres have had a week to recover and prepare after being beaten by Ulster last Friday, Saints were in European action against Glasgow last Sunday.
"The tournament scheduling has not been particularly kind to us in the first two rounds," Northampton rugby director Jim Mallinder said. "And having just five days to prepare for a tough match is certainly not ideal."
He added: "However, we are going to France in good spirits after showing our character last Sunday to fight back and secure a bonus-point win, and we will be doing everything we can to get the positive result we want."
Northampton are without injured full-back James Wilson, so Stephen Myler switches positions and Ryan Lamb starts at fly-half in a team otherwise unchanged from the one that defeated Glasgow 24-15.
Glasgow face a crucial encounter at home to Ulster on Friday, knowing they must beat last season's tournament runners-up to realistically keep alive their quarter-final hopes.
"We were pleased with how we performed in the first 30 minutes at Northampton," Glasgow head coach Gregor Townsend said. "But we are well aware that against the calibre of opponents we play in this competition we need to be at the top of our game for the full 80."
Glasgow will be without wing Sean Lamont, who suffered a facial injury against Saints, so Alex Dunbar lines up in the number 11 shirt, while two changes up-front see starts for lock Tom Ryder and flanker Chris Fusaro.
Ulster field their influential South African half-back Ruan Pienaar for his first start since completing Test duties in the Rugby Championship, with back-row forward Nick Williams also returning. But star flanker Stephen Ferris has not recovered in time.
"Glasgow are a formidable team, particularly at home," Ulster head coach Mark Anscombe said. "We have to play for the full 80 minutes against them if we are to come away with the win. We can't afford to put in a performance for 50 or 60 minutes, like we have done in previous weeks."
- Stade Ernest Wallon