Frenchman, who is on loan at Sevilla, says Guardiola saw early nights as the key to staying fit.

Manchester City midfielder Samir Nasri says that Pep Guardiola’s ban on sex after midnight might have helped his players avoid injury

Nasri, who joined Sevilla on a season long-loan last summer, says that Guardiola was convinced that players from his former clubs, Barcelona and Bayern Munich, benefited from the stringent rules which he now uses at the Etihad.

“[Sexual] Relations must be before midnight. Even if you have a free day the following day,” Nasri told L’Equipe du Soir. “He told us this is how he managed to get the best out of [Lionel] Messi and [Robert] Lewandowski, and for them to avoid the maximum number of muscular injuries. It’s so you can get a good night’s sleep.”

The former France midfielder also revealed that he was called a “waste” by Guardiola, yet is still glad he worked under the Spaniard – albeit briefly.

“I’ve been very lucky, I’ve had a mix of coaches this year,” he added. “I did the preseason with Guardiola and he made me realize a few things.”

Nasri insisted that Guardiola had wanted him to remain at City even though he could offer him no guarantee of regular football.

He said: “He told me: ‘You’re a waste! With the talent you have, you shouldn’t be here at Manchester City, you should be at Barcelona.

“I had several arguments with him and I had my doubts at the beginning, but in the end, I realised that he is a coach of the highest level. He made me reflect.”

After returning to pre-season training overweight, Guardiola did not play him in the first four games and made him train on his own.

“When I arrived Guardiola told me that my weight should be 76kg,” the 29-year-old said. “I had not weighed that since my time playing for Marseille because in the Premier League, there is always a plan to gain more muscle. He wants slim and physical players. I arrived with four more kilograms and with Guardiola, if you are overweight by more than 2.5kg, you cannot train with the team. I had to train on my own.”