The Paraguay defender moves to Goodison Park on a free transfer from Wigan Athletic.
"I know him really well and he knows me very well also," Alcaraz explained to evertontv. "We had a very good relationship in the three years at Wigan and I want to continue that. Nothing is going to change, he is very professional.
"I have learned many things with him. He gave me a lot of support when I came here, when I was new in this competition. It is totally different and he gave me many lessons on how to adapt to this type of football.
"Thanks to him I adapted quickly to English football. There are many things I can say thank you to Roberto for, for my years here in England."