After being out of Super Rugby for a year following the head knock he sustained last season, Ngatai returned with a strong performance against the Reds in New Plymouth on May 6, but following the bye he had headaches post-training on May 15.
That saw him ruled out of the match against the Crusaders in Fiji, and the Chiefs understandably played it cautiously in keeping him out of the game against the Blues in Auckland last Friday.
