Jose Enrique has no doubt about the defining point that turned his career upside down.
It was 2013 and Brendan Rodgers's Liverpool had a made a strong start to their new Premier League campaign.
Three successive 1-0 wins - all secured with Daniel Sturridge goals - had taken Rodgers's Reds to the summit during the early going of what would, over time, develop into a surprising yet memorable crack at the title.
Enrique, as the Liverpool left-back, was more than playing his part too.
Seven starts and two substitute appearances before the second week of November suggested the Spaniard was Rodgers's man, despite the arrival of Aly Cissokho on loan in the dying embers of the transfer window.
But, as the Merseyside derby approached later that month, Enrique was left facing up to a grave realisation at Anfield.
After playing for two months on a meniscus tear that was kept private, it was time to accept that surgery would be needed.
"After that you could see my career went from like that (high) to like that (downwards) and I never recovered from that injury, that is the reality," Enrique tells the ECHO.
"I always wanted to contribute more to the team but the reality is if I could have done something more, maybe I would have some regrets about it, but I couldn't. My knee wouldn't let me play.
"I was playing one day, resting two and you cannot be a Premier League player that way, that is the reality.
"Obviously it took me time to accept and it was hard to see from the stands, but that's why I didn't play and I needed to accept it.
"At one point, even with painkillers, they wouldn't let me play with the knee.
"Even with the operation, it was much worse than we thought. After that, I never recovered. I was never the same again.
"That was the end of my Liverpool and football career because I went to Zaragoza and had a two-year contract but I just played the one.
"So that knee injury ruined my career, definitely."
It's one of the reasons why the retired 34-year-old was so keen to align himself with Switch & Co, a wellness company designed to keep people active physically, mentally and socially.
The former Reds star became an ambassador for the company after striking up a relationship via social media and he is aiming to extol the virtues of exercise and the beneficial impact it has on both physical and mental health, with their help.
Enrique kicked off an eight-week schedule on his Instagram account on Monday, giving his followers access to the Switch+ platform which enables users to be active wherever they are until the end of January next year.
He says: "Listen, exercise is key. I got in touch with Switch and we had an agreement.
"It was something I really wanted to do for a while. I didn't find a way until Switch got in touch and it was amazing.
"For me, when you feel better with yourself, you are more happy and that is what Switch is trying to do.
"When you are eating healthy, being more healthy, exercising, you like to put more clothes on, take more care of yourself and that is something I do daily.
"It has helped me massively with my mental health. Not just physically but mental health. Now for me, [mental health was] something I didn't believe in.
"I used to think it was for someone who maybe needed psychologists and psychiatrists and it was for people that were maybe not healthy mental-wise or they have a problem but it is not true.
"Mental health is in the life of everyone and people that we really know. Just yesterday (the death of) an ex-player who used to play for Manchester City (Jeremy Wisten) was in the news.
"He was a really young player, mental health [affects] everyone. So with all that is happening, [the message is] be positive. With Switch, that is what we try to do."
Enrique, of course, speaks from experience.
His health problems have gone far beyond an inability to play elite-level football over the past couple of years.
It was back in 2018 when he was diagnosed with chordoma, a rare type of tumour that was discovered behind the former defender's right eye.
The tumour had attached to an artery and would require an eight-hour operation and two months of subsequent radiotherapy.
For Enrique and his partner, Amy, it was a scary time, but it put the long-standing issues over football injuries into neat perspective.
In a perverse way, Enrique admits, the diagnosis gave him a focus after his playing days had ended before time.
"I didn't say 'now is the time to retire'. No, I retired because I couldn't play football and it was very hard to accept that," Enrique says in a candid chat over Zoom on Monday morning.
"I had a lot of mental health issues over that. And then all of a sudden, I had a tumour and in a very strange way, it gave me a focus again.
"So it was like 'OK, I need to get well. I don't want to die. I want to live.'
"I had a focus again and it was like I would do everything the doctors says, have your treatment and you will be all right.
"And I was really positive. I had my down days, like everyone else, don't get me wrong.
"But with modern day times with the treatment and everything, I was very surprised by how positive I was.
"That all came after my recovery. I expected I was going to be the same person as I used to be, physically, but I wasn't.
"I had some ear problems, I had some eye problems. In my ear, it has gone, it's perfect but my eye still bothers me a bit.
"I don't produce any tears in that eye and it's really hard when I watch too much TV or I do too many interviews!
"But after it, it completely changed my life forever and I see life completely different, so that is what we talk about now.
"It's something that changed my life for good in a strange way. I see life differently now.
"When you retire from football you think it is all finished and the best moments of your life have gone and in a way, it is true, because being a footballer is irreplaceable.
"But when it happens you see other ways where you think 'wow! I am really privileged'. I am a privileged man, mate.
"What we want to show with Switch is that, it has changed my life for good."
