Ryan Lamb is named at fly-half for Northampton Saints's trip to Castres.
Northampton Saints have named a shuffled back-line for their trip to Castres.
Fly-half Ryan Lamb comes into the side in place of New Zealander James Wilson.
Lamb's inclusion moves last week's fly-half Steven Myler to full-back.
Castres have changed their whole pack after their 41-17 defeat to Ulster as well as introducing Romain Martial, Paul Bonnefond, Remi Tales and Rory Kockott to a new-look side.
Castres: Teulet, Martial, Bonnefond, Bai, Garvey, Tales, Kockott, Lazar, Mach, Peikrishvili, Tekori, Samson, Bornman, Faasalele, Claasen
Northampton Saints: Myler, K Pisi, G Pisi, Waldouck, Artemyev, Lamb, Dickson, Tonga'uiha, Hartley, Mujati, Manoa, Lawes, Dowson, Wood, Oakley
Result: London Irish 39-17 Northampton Saints >