LOKI Crichton will miss Fri-day's trip to Sale after picking up a stinger injury in the 12-11 defeat to London Irish.
The Worcester fly-half is set to be replaced by Shane Dra-hm just two weeks after re-turning from National League One loan at Launceston.
The Aussie number 10, who heads off to Kubota Spears in Japan in the summer, only spent one week with the Cornish side before being recalled to come off the bench against the Exiles last Friday.
Worcester Warriors director of rugby Mike Ruddock said that centre Dale Rasmussen is struggling to make the trip.
"Loki is definetely out with a stinger injury, while Dale will possibly miss the game with a leg injury," said Ruddock.
All Black wing Rico Gear should be fit despite a hamstring pull, while prop Darren Morris is rated as 50-50 as he recovers from a stinger injury picked up against Saracens on February 10.
Having been fined two weeks wages for dissent against London Irish, flanker Drew Hickey is expected to be axed from the starting XV.
The players were yesterday working with motivational coaches from Australian company Leading Teams, a firm that helped Auckland Blues turnaround their Super14 season last year.
Tim Collier will appear before an RFU disciplinary panel on Monday after being sent off in Launceston's clash with Nottingham.
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