Benitez is clearly unimpressed by the Special One's talents as he prepares to face him for the 10th time in the last two seasons.
He is begrudging in his praise of the championselect and the Spaniard claims money-bags Abramovich is the most important figure at Stamford Bridge.
"It's very simple, they have spent more money than anyone else on players," said Benitez. "Abramovich has done a fantastic job with his team.
"After 50 years they are winning two leagues and that's really good.
"Jose Mourinho has done a good job, but for me the owner is the key. All of them are important, but you can't do anything without Abramovich and he started the revolution."
And Benitez claims Mourinho should be winning the Premiership every year because he has the biggest transfer kitty in world football.
"They have a lot of good players so they must be at the top of the table and they must be in cup finals," he added. "When you spend big money it's normal to be at the top of the table and in finals."