Mancini is looking to steer City to fourth place and a Champions League qualification place and has been training his players twice a day in the run-in to the end of the season.
"The players are not happy with this. We are at the end of a long season, we have big matches, we are tired but there are still double training sessions, morning and afternoon," Tevez told the Daily Mail.
"Then, the next day, we train for two hours. I do not understand. But, please, he is the coach and I am the player. He is in charge. I am OK with him."
Tevez's comments come after his former United team-mate Rio Ferdinand claimed the 26-year-old was a reluctant trainer during his time at Old Trafford.
The Argentina international has scored 22 Premier League goals since his move to City, but England defender Ferdinand has mischievously suggested that the energy Tevez shows on a matchday is not necessarily reflected in his attitude to training.
"Carlos is an interesting character. When he was at United, he saved all his energy for the games - he didn't really go over the top at training," Ferdinand told The Sun.
"He worked hard in the gym - he was a professional in that sense - but everything he did was geared towards the match at the weekend.
"You could see him conserving his energy during the week and then laying it all on the line out on the pitch.
"That's not the way I operate, I have to train at a high level every day. But it works for Carlos and he can be a real handful to defend against."
Source: PA
Source: PA