Waratahs lock Rob Simmons will miss the side's tour to Africa and Argentina, ruled out with injury.
Simmons suffered a quad injury in the Waratahs' 34-27 win over the Stormers on Saturday night, and was a last-minute scratching from the tour after scans revealed the extent of the injury.
The 28-year-old played 57 minutes of Saturday night's match, before being yellow-carded, and then replaced.
Youngster Lachie Swinton will replace Simmons in the 27-man squad that left for Africa on Sunday morning.
It's a major blow for an already undermanned Waratahs pack, which will be without tighthead prop Sekope Kepu for the next two matches as well.
Simmons is the side's lineout caller and that part of the match was fairly effective in Sydney.
Ned Hanigan would be most likely to replace Simmons in the second row, with Nick Palmer another second row contender and Swinton an option in the back row or at lock.
NSW forwards coach Simon Cron said they wanted to take a cautious route with the Wallabies lock.
“We initially thought it was just a tight quad but the scan revealed a small tear. Upon medical advice, we have decided to let Rob stay at home to get the full treatment,” he said.
“Lachie has the flexibility to cover both lock and loose forward and with Ned likely to play in the second row, Lachie was our best choice replacement.”
Michael Hooper (Captain)