The 20-year-old signed a five-year contract with the Blues on Friday following weeks over speculation linking him with a transfer to Stamford Bridge.
And the Netherlands international, who made 33 Eredivisie appearances last season and scored eight goals as Vitesse Arnhem finished fourth, revealed that he spoke to the Portuguese coach before finalising his move to west London.
“It [pre-season training] will be the first time I meet him in person,” Van Ginkel told Algemeen Dagblad.
“We spoke a few times on the phone. That was important. It’s good to hear that a coach really wants you. That convinced me.
“The story around Chelsea was around for a longer period. But in the last few days it became really concrete.”
“I played three years at Vitesse, but the Premier League is very good, and I will enjoy playing with these players with this experience.”