Francis is expected to miss Friday's match against the Chiefs at Eden Park due to concussion after copping an errant swinging arm from Stormers second five-eighth Shaun Treeby on the chin in the 47th minute.
Speaking after the 30-22 loss which probably ends the Blues' playoff hopes, Umaga said the team doctor confirmed Francis was unconscious as a result of the blow. The first-five was taken from the field and replaced by Bryn Gatland.