Champions Cup last 16 team news and line-ups
With Trevor Davison and Manny Iyogun both ruled out, Danilo Fischetti starts at loose-head prop, Luke Green retains his place as the tight-head and Craig Wright takes over from Curtis Langdon as the starting hooker. Callum Chick comes in at number eight, with Henry Pollock switching to open-side flanker and Tom Pearson dropping to the bench. England centre Fraser Dingwall teams up with in-form Tom Litchfield in the midfield, while George Furbank captains the Prem leaders from full-back.
Castres ended a three-match losing run by beating bottom-side Montauban last weekend to move into 10th place in the Top 14. They are captained by flanker Baptiste Delaporte, while former All Blacks centre Jack Goodhue is one to watch in the backs. Northampton: Furbank (capt); Freeman, Litchfield, Dingwall, Ramm; Belleau, McParland; Fischetti, Wright, Green, Lockett, Van der Mescht, Kemeny, Pollock, Chick.
Replacements: Langdon, West, Kundiona, Prowse, Munga, Pearson, Weimann, Hutchinson. Castres: Chabouni; Ambadiang, Botitu, Goodhue, Karawalevu; Herve, Fernandez; Walcker, Durand-Pradere, Corato, Ducat, Vanverberghe, Delaporte (capt), Ardron, Papalii. Replacements: Colonna, Guerois-Galisson, Azar, Maravat, Cope, Ramototabua, Arata, Palis.
Assistant referees: Morne Ferreira (South Africa), Jonny MacKenzie (Scotland) Listen on BBC Radio 5 Sports Extra, BBC Radio Northampton and BBC Sounds, with second half on BBC Radio 5 Live. Follow live text updates on the BBC Sport website and app. Venue: The Rec Date: Saturday, 4 April Kick-off: 15:00 BST Bath are showcasing their strength in depth with wholesale changes to the side that beat Sale in The Prem last weekend.
Only Joe Cokanasiga and Santi Carreras keep their places as many of Johann van Graan's big hitters return to a team captained by scrum-half Ben Spencer. He is joined in the half-backs by Finn Russell, with the England international trio of Ollie Lawrence, Max Ojomoh and Henry Arundell making up the back line. Beno Obano, Tom Dunn and Archie Griffin return to the front row and Josh Bayliss, Guy Pepper and Alfie Barbeary form a strong back row unit.