The left-back tells about the incident in Anderlecht's league match a few weeks ago, the one that made him worried.
I had the ball, was knocked down and didn't have time to catch it with my hands, he says.
The 30-year-old hit his head hard on the ground. The referee was quick to arrive – but not to check how the Swedish veteran was doing.
He lifted me up, didn't ask how I was doing and has received criticism for it, but has apologized. I played on, but afterwards, I didn't remember anything. Now and then, I didn't know where I was, and it was a bit unsettling.
"Didn't take it seriously"
You got a bit worried. I had never before in my career gotten a blow to the head and lost my memory. I didn't take it entirely seriously, thinking it's just a matter of pushing on.
Augustinsson did a lot of tests, followed the concussion protocol, and was prescribed rest.
I stayed home for a few days, and it quickly got better. After about ten days, it was over.
Concussions can be sneaky. Do you do any follow-up examinations?
Not right now. The club did all possible checks, and the club took good care of me. I've played two matches now, and I feel safe.
The competition for the left-back spot in the national team has become fiercer, not least thanks to Gabriel Gudmundsson's strong play in Lille.
Even Ken Sema is an alternative on the position.
Fighting for the spot
Augustinsson doesn't dare take his place against Slovakia in the Nations League in Bratislava on Friday for granted.
I don't see it as my spot. I come here, and I always want to play. Whoever Jon thinks is best for the day should play.
Last time, I played a match, he (Gudmundsson) one. We'll see how Jon thinks in terms of tactics and form. It's good when you feel the breath on your neck, says Augustinsson.