Cahill was the Spaniard's best man at his wedding last month and was thrilled when he heard the news that Arteta had penned a long-term deal to stay at Goodison Park.
"We have spent a hell of a lot of time together over the summer," he told evertontv.
"He is someone who thinks the world of Everton, like myself.
"I was always in his ear and when he put pen to paper I was one of the first people he spoke to and I was over the moon."
"There is so much anticipation for the home game," he added.
"It is another hard game but it is exciting just to play and see what happens."