But even though the fly-half is set to miss the Australian Barbarians game, he has vowed to line up against the Wallabies on June 12.
He said: "Injury-wise I'm fine. I took a knock in the back in our last game of the season.
"I have already had a week [without contact work] and I'm being held back by the physios rather than anything else at the moment.
"I want to get out there but they are telling me to take a few more days."