The defensive pair did not travel with the Canaries squad as they look to recover from knee and groin injuries respectively.
"I think it was better for the ones left at home, Seb and Michael especially, to stay there," said manager Chris Hughton. "They wouldn't have taken part in any of the games over the 10-12 days.
"You can't go straight into the work at too high an intensity. The first thing that we have got to do is make sure that we have got as many players training for 100 per cent of the sessions that we have got - so that they don't miss a session."