The inside centre was knocked out in a clash of heads with new midfield partner Jack Goodhue in the first half of the 38-13 rout at Sydney's Olympic stadium and played no further part in the match.
The 29-year-old has suffered a litany of head knocks over the past two seasons, missing games for the Canterbury Crusaders in Super Rugby earlier this year, and will be sidelined for Saturday's return match at Eden Park.
His sister Shea Crotty, who has played basketball for New Zealand, aired her concerns on social media.
