He was knocked out following an accidental collision in the opening exchanges of the defeat to South Africa in Japan.
“There isn’t really much to watch from my point of view – I was only on the field for a minute or two,” said the Bristol Bears prop, ahead of their first meeting since that night on Saturday.
“It’s a tough one. It took a while for me to process what happened. Since I could remember all I wanted to do was play for my country... and then you get to that moment and I can’t remember any of it.
“It was quite tough, but that is the universe’s plan for me and I have to just keep my head and use it as motivation now.”
Sinckler played a far more significant role in Saturday’s 32-15 win over Australia, putting in a 72-minute shift as the most experienced operator in a front-row shorn of fellow props Joe Marler and Ellis Genge due to Covid.
He said: “If I am being honest, I think we are more satisfied with the result (than performance). We had to really, really dig deep.
“It wasn’t perfect and it is never going to be perfect.
“We were a little bit scrappy and the breakdown needs to improve, set piece – we got there in the end – but definitely we need to improve for next week.
“But in terms of result, to put 30-odd points against a top quality Australia side, we will take that – especially with how chaotic the week was.”
Having also lost against the Springboks with the British Lions in the summer, Sinckler has further desire to deliver.
“I’d be lying if I didn’t look at this fixture and was like ‘I need to be ready for that game’,” he said.
“It’s a huge game and they’re the best.
“We’ve got to be there.”