Sexton will miss this weekend's Rainbow Cup game against Connacht.
It’s almost a month since Sexton suffered his latest blow to the head in the Heineken Champions Cup quarter-final win over Exeter.
Meanwhile, Rhys Ruddock has been ruled out for up to six weeks with a calf injury.
Ulster will be without John Cooney and Robert Baloucoune for Friday’s Rainbow Cup meeting with Munster.
Both players are observing the return-to-play protocols having suffered concussions in the Challenge Cup defeat to Leicester.
Meanwhile, Munster confirmed today that RG Snyman requires a procedure on his knee.
The South African lock suffered a setback in his return from an ACL injury.
Snyman hasn’t played since sustaining the injury in his debut match in August.

Tuesday Morning Sports Update
All Ireland Football Championship Opening Round Fixtures Confirmed
Tommy O'Brien Among Injury Doubts For Leinster's Champion Cup Final On Saturday
Monday Morning Sports Update
Sunday Evening Sports Update
Mourinho's Benefica Go Unbeaten but Miss Title
Brave Kildare Fall Short in Leinster Ladies Final
Chelsea Appoint Xabi Alonso as New Manager