The 25-year-old came into the new season in questionable condition, prompting talk he could seek a move back to Europe, having previously spent six years with Belgian outfit Lokeren.
However, Comitis is adamant Patosi is on the straight and narrow after his first season with the club last term was hampered by ill-discipline.
"I'm confident that he's on the right track and this is pleasing as Patosi is still very much part of our plans," Comitis tells KickOff.com.
"He went to the bush for a month-and-a-half and is back with a vengeance. His off-the-field antics is all in the past now and he is focused on his football.
"He's one of those players that does not shy away from a challenge. He is a very important player for our club and is going nowhere."
Comitis says the club are trying to uncover the cause of Patosi's weight problem.
"We're in the process of doing a proper DNA test to determine what the real causes are," Comitis explains.
"He could be lactose intolerant due to eating too much yoghurt. This isn't out of the ordinary, you know."
The Citizens at 15h00 will clash with Mamelodi Sundowns in the second leg of the MTN semi-finals at Lucas Moripe Stadium. Benni McCarthy's side won the first leg 1-0.