France star Paul Pogba says his time at Manchester United was like being on holiday in comparison to the work he has to do at Juventus.
Pogba has helped Juve win three consecutive league titles since controversially quitting United in 2012.
In an interview with Italian paper La Stampa, Pogba also tipped Argentinian team-mate Paulo Dybala as a future winner of the Ballon d'Or.
"People need to know that nothing at Juve is easy," Pogba said. "There is a different culture of work compared to elsewhere. I was at Manchester: it seemed like being on holiday.
"Here we work so much. All these titles, we didn't steal them. It was by working right to the end."
Pogba, who joined United as a 16-year-old academy trainee, was accused of a lack of respect by former United boss Alex Ferguson after refusing to sign a long-term contract at the club following his promotion to the first team squad, for whom he made only three appearances.
Pogba, a regular subject of speculation about a big-money move back to the Premier League, also revealed that Manchester City midfielder Yaya Toure is one of the players he spends most time watching in a bid to improve his central midfield performances, along with Barca's Andres Iniesta and Bayern Munich's Arturo Vidal, a former Juve team-mate.
But he believes Dybala, 22, could turn out to be better than all of them.
Dybala, a summer signing from Palermo, has scored eight goals in 16 Serie A appearances at Juve.
Asked if Dybala had the potential to emulate his compatriot Lionel Messi and win the European player of the year award, Pogba replied: "He can get there.
"Do you know what I call him? Square R2, the button that you have to push on a Playstation to do a shot on the turn: he always gets goals like that.
Do you know what I call him? Square R2, the button that you have to push on a Playstation to do a shot on the turn: he always gets goals like that.
"Has he surprised me? No, because I always said he was a phenomenon. To do what he has done, playing for Juve, is something phenomenal."
Having dominated Serie A since Pogba's arrival in 2012, Juventus have found the going tougher this season following the departures of Carlos Tevez, Andrea Pirlo and Vidal.
But after a disastrous start, Massimiliano Allegri's men have recently hit form, reeling off seven wins on the trot to move to fourth in the table and within three points of leaders Inter Milan.
"It is different (without Pirlo etc)," Pogba said. "There is more responsibility on other players and we've had to think about playing together even more."