Waratahs hooker Tatafu Polota-Nau has revealed he will consider retirement or taking a long break from the game if he suffers another serious head injury.
Polota-Nau, who has had several concussions in recent seasons, left the field during the early stages of his side's win over the Brumbies in Canberra on Friday after sustaining another head knock.
The 29-year-old Wallaby changed his tackling technique last year and had no more problems but was forced to sit out two matches earlier in 2015 after suffering another head knock in training.
And with the World Cup in England less than five months away, he admitted that his welfare is a major concern.
"At the end of the day it will come down to taking those right precautions, because if I do, for instance, get another head knock, then I will probably have to consider either taking a long stint off or even hanging up the boots," Polota-Nau told AAP.
"There's more to life than just rugby, but at the same time I still feel like I've got unfinished business with rugby itself."
He will now undergo concussion protocols before being cleared for the Waratahs' clash with the Western Force in Perth on Saturday.
"With my previous one (head knock) the symptoms were delayed, whereas I'm not too sure if they are going to be delayed (this time)," added Polota-Nau.
"But at the same time I'm feeling great. I actually wish we could play the Friday game again.
"If I'm right, I'm right if I'm not, then I'm not.
"I think the great thing with not just the Waratahs, but the ARU as well, are really caring about my welfare."