Cahill has confirmed there was a dressing room row following Saturday's 2-1 defeat by West Brom at The Hawthorns, but he believes it is good to see a reaction after a result like that.
He said: "From last year, when he took the job, he did tremendously well and achieved such a lot in a short space of time.
"We started the campaign really well. We're all behind him and he's definitely the right man.
"He proved it last year and I'm sure he will prove it this year as well.
"In the short space of time I've been here, losing games is not acceptable. When you do lose, people are disappointed, hurt and upset.
"Sometimes, things need to be said and I think it's great to have that reaction.
"I'd be worried if people were just going in, getting showered and then getting on the bus.
"What happens in the changing room stays there, but it's definitely a positive reaction when that happens in football."