The former Blues midfielder said the Special One started to lose the dressing room years before he was sacked in late 2015.
Ramires joined Chelsea in 2010 when Carlo Ancelotti was manager and was still part of the Blues squad when Jose Mourinho returned to Stamford Bridge in 2013.
The Special One's first season back at Chelsea was, according to Mourinho, one of transition, but the Blues still finished third in the Premier League and reached the Champions League semi-finals.
But Ramires has told that it was the semi-final defeat to Atletico in 2014 where the tide began to turn for Mourinho.
After the game, Mourinho publicly criticised star man Eden Hazard, who fell asleep whilst marking the attacking Juanfran, and the full-back squared for Adrian who fired home.
Mourinho branded Hazard as not being ‘mentally ready’ to do his defensive work and blamed the Belgian for things going wrong for Chelsea that day.
Ramires said, “That had a big impact because he started to lose control of the squad,” admits Ramires. “It’s one thing to say something internally, but it’s totally different to criticise someone publicly.
“Hazard was our main player, and what he did affected Eden’s game.
“Hazard used to collect the ball and attack the opposition. He started to pass the ball much more, and we missed our main attacking threat.”
While Chelsea won the Premier League the following season, Ramires added that the ill-feeling from the Atletico defeat the season before still remained in the air amongst the Chelsea players.
The Brazilian midfielder said that other players began to jump on the anti-Mourinho bandwagon which came to a head in the 2015/16 in the season the Portuguese manager was sacked.
Ramires added: “The atmosphere became really heavy. There were guys who were already angry because they weren’t playing.
“When something like that happened with Hazard, those who weren’t playing had another ally against the manager.
“It became a snowball that only got bigger. It reached a stage where nothing would smother the incident "