Currently, the Porcupine Warriors train at the Adako Jachie training complex, which is still under construction.
However, in an interview with Kumasi's Nhyira FM, Barreto blasted the club for lacking washrooms at the training facility.
"For a big club like Kotoko, I can't fathom how our players come to training and have to go to toilet and urinate in the bush,” he said.
He also demanded that the club's last league game of the season be investigated.
On the final day of the 2020-21 Ghana Premier League season, Kotoko were defeated 1-0 by Elmina Sharks.
“In the last match some strange things happened. I have already said that these issues have to be investigated and punish those that have to be punished,” he said, as quoted by Citisportsonline.
“This is to the board of Kotoko and these things should not happen. Kotoko is a big brand and one of the biggest clubs in Africa,"
“What happened this season I hope never happens again to any player or coach,” he concluded.