Samir Nasri claims Pep Guardiola has banned Manchester City players from having sex after midnight in order to improve their performances on the pitch.
France midfielder Nasri was told he was overweight by newly-appointed City boss Guardiola in July, and left the following month for a season loan at Spanish side Sevilla.
But, in an interview with L'Equipe du Soir on Monday evening, the 29-year-old reportedly revealed one of the Catalan's top tips for getting the best out of his players.
"On a free day he says, 'Those who want to have relations, it's before midnight because you must have a good night's sleep'," Nasri was quoted as saying of the former Barcelona and Bayern Munich coach.
"He did that with (Barcelona forward Lionel) Messi, who since then was not injured muscularly, and (Bayern striker Robert) Lewandowski, whom he had put on the bench at one point, and made him understand certain things."
The former Marseille and Arsenal man also spoke a little about Guardiola's dietary demands.
"When I arrived for pre-season, I was told, 'Your weight must be 76kg'. That was my weight when I was at Marseille.
"He suppressed a lot of things in the kitchen. When I came back from vacation, I was a little out of shape, I had four kilos extra. With Guardiola, over 2.5 kilos in excess, you do not train with the group."