Australia fly-half Quade Cooper will undergo scans on Monday to determine the extent of the shoulder injury he suffered on Saturday.
Cooper was injured just after setting up an early try for Mike Harris in the Queensland Reds' 30-27 Super Rugby defeat to the Melbourne Rebels in Brisbane.
He was on the field for just eight minutes before landing heavily on his shoulder when he was tackled by Rebels pair Laurie Weeks and Tom Kingston
Cooper faces at least a month on the sidelines after being diagnosed with a grade three AC separation in his left shoulder, although the Reds have confirmed that he did not sustain any damage to the bone.
But he is now likely to miss Australia's three-Test series against France next month, with Wallabies coach Ewen McKenzie naming his 32-man squad on Thursday.
A statement issued by Reds coach Richard Graham read: "Quade had X-rays following the game and was cleared of any bone damage.
"He will have an MRI on Monday and following that will consult the specialist to see what is the extent of the injury.
"At this stage we know he has a Grade 3 AC joint injury and we are hopeful it ends there."
In an interview after the game, Cooper said: "I knew there was something wrong.
"I heard a bit of a crack and I could feel that my shoulder wasn't sitting right so I was told I had dislocated my AC joint."