The Leinster pair were pulled out of Saturday's RBS Six Nations clash at Murrayfield, late last week, but an extra week off before February 27th's arrival of the World Champions - 18-17 losers to France on Sunday - to Dublin should see them both returning.
"The week off gives us the chance to get people back, get a break and come back refreshed for the England game," said O'Sullivan - who was celebrating his 30th win in his 41st game in charge.
"That is going to be a very physical match but the boys are going back to Lansdowne Road - which has been a good hunting ground for us.
"It is going to be a phenomenal atmosphere and we are looking forward to the England game. We will recharge our batteries and come in next week, ready to go - we are certainly champing at the bit," he added.