Emmanuel Petit says Philippe Coutinho must constantly question why he joined Barcelona - just as the Frenchman did when he quit Arsenal.
Coutinho completed a "dream" £142million transfer from Liverpool to Barcelona in January 2018 - 18 years after Petit's £7m switch.
But Coutinho's dream quickly turned into a nightmare, with the Brazilian falling down the Nou Camp pecking order and being loaned out to Bayern Munich.
Liverpool meanwhile have gone from strength to strength without the Brazilian, winning the Champions League last season and dominating the Premier League this campaign.
And Petit, who watched Arsenal improve after his transfer to Barcelona in 2000, believes Coutinho will be filled with regret, just as he was.
"If I was Philippe Coutinho, every morning I would wake up and think to myself, 'Why, why, did I sign [for Barcelona] in Spain?'" Petit told Mirror Football.
"And do you know why I say this? Because, I can remember the time when I'd wake up, when I was at Barcelona, when I left Arsenal, and I was thinking the same way, 'Why did I leave? Why did I leave? Why did I leave?'"
"And to be honest with you I am sure Coutinho has been asking himself the same question for a while now. He left for Bayern Munich, he does sometimes play well but he's not really a first-team player."
Bayern Munich stumped up £7.78m to sign Coutinho on loan in January and have the option of making the deal permanent at the end of the season.
The Bundesliga giants have no current plans to exercise this clause however, and Coutinho has subsequently been linked with a return to the Premier League.
Petit reckons a move back to England would be beneficial for the 27-year-old, but has ruled out him ever pulling on a Liverpool shirt again.
"I'm pretty sure it would work out for him [returning to England]. He fits perfectly with the Premier League," Petit added.
"He's got the vision, the technique, the speed, he can strike, he has the creativity.
"We all know what he is capable of. I was a big fan of his when he was at Liverpool. I would be very, very happy to see him back in the Premier League.
"He won't go back to Liverpool. When I was at Barcelona, they wanted me back at Arsenal, and it was tempting - I was close to returning to Arsenal.
"But at the end of the day, I was thinking 'Emmanuel, you need to be honest with yourself. If you left a year ago it was for a reason.'"
"If Coutinho is honest with himself, since he left Liverpool they have won the Champions League and they're on the way to winning the Premier League. Liverpool haven't needed him, so why would he go back to Liverpool?"
* Emmanuel Petit is a Paddy Power ambassador. To read more, go to news.paddypower.com