Northampton Saints have cancelled the signing of Western Force full-back Cameron Shepherd over fitness concerns.
Saints announced the signing in May but now say his three-year contract was "subject to a number of conditions".
The club state that their medical team have recommended against bringing the 28-year-old to Franklin's Gardens.
"We needed more certainty about his ability to handle the tough demands of our long season," director of rugby Jim Mallinder said.
"Obviously it is important to believe we will get the most out of our squad throughout the season.
"We know Cameron has ability and are confident that he will be with another club soon.
"But while we are disappointed that Cameron will not be joining us we are nevertheless very confident in the ability of our squad to compete in every competition this coming season."
"They have settled in well, bonded with the rest of the squad and worked very hard in pre-season training and we are all looking forward to the start of the season," said Mallinder.