Exeter 's Luke Cowan - Dickie comes in for Jamie George , who ruptured a tendon in his left bicep while training on Tuesday .
Joe Launchbury is fit enough for a place on the bench .
Exeter 's Luke Cowan - Dickie comes in for Jamie George , who ruptured a tendon in his left bicep while training on Tuesday and Joe Launchbury is fit enough for a place on the bench .