NSW Waratahs star Bernard Foley says the return of his concussion symptoms was not a result of playing in last weekend’s win over the Melbourne Rebels.

The Wallabies five-eighth is in extreme doubt for the Super Rugby home clash with the Crusaders on Sunday due to the return of post-concussion symptoms, which had sidelined him for the first four rounds of the season.

“It’s been a frustrating week, in terms of symptoms just re-occurring. Nothing to do with the game last week, it’s just sort of come back after the game,” Foley told Sky Sports Radio on Friday.