All Black captain Kieran Read suffered a double haematoma in his comeback match against the Hurricanes in Wellington.
He picked up the injury in the 20th minute of the match and was down for a lengthy period, before forcing himself up.
He saw out the rest of the first half, but it was clear he was in some discomfort and coach Scott Robertson took him off at the break.
“Technically he has got a double haematoma,” Robertson told reporters.
“He got two knocks in the same place and he seized up at half-time, so we took him off.”
With Sam Cane (neck) and Liam Squire (knee) both first-choice loose forwards out with long-term injuries, All Black coach Steve Hansen will be holding his breath that Read will be available sooner rather than later.
Read has played 134 Super Rugby games and 118 tests for the All Blacks.
The 33-year-old did not resign with the New Zealand Rugby Union and will leave for Japan after the World Cup.
Meanwhile, the Sunwolves shocked the Waratahs by beating them 31-29 in New Castle.
In was just a week ago that the Waratahs defeated the mighty Crusaders in Sydney.
The Sunwolves scored four tries thanks to a hat-trick by Fijian wing Semisi Masirewa and a try by South African lock Grant Hattingh.
The Waratahs replied with four tries of their own by scrumhalf Nick Phipps, wing Cam Clark, flank Michael Hooper and centre Kurtley Beale. Pivot Mack Mason added two conversions and a penalty, while Beale also added a conversion.
Written by Carl Coertzen
Image Credit: Rugby Pass