The two clashed during the Portuguese's first reign at Stamford Bridge while the Spaniard was in charge of Liverpool, and Mourinho begins his second stint at Stamford Bridge in the wake of Benitez's temporary six-month tenure with the Blues.
Benitez, who has since been appointed as the new boss of Napoli, suggested that Mourinho lacked humility and crossed the line of what was acceptable in order to win.
"I don't know what Mourinho does," Benitez told AS.
"I know what I do - I always want to win, without crossing the line of sportsmanship.
"It's true that I get on better with some coaches than others and I align myself with those that don't value winning at any cost."
Benitez won the Europa League with Chelsea.