The Netherlands international struggled to break into the first team at Stamford Bridge, making just two league appearances in five years at the club.
|11/4||Sunderland are 11/4 with Bet365 to finish in the top half of the Premier League|
On Friday, it was confirmed that the 23-year-old had joined Sunderland on a four-year deal and Van Aanholt is thrilled at the opportunity to display his quality.
"I thought about it for a second and said: 'Yes, I would love to come to Sunderland'," he told the club's official website.
"It's a great club and a great opportunity for me to play in the Premier League.
"It's a good opportunity for me after two-and-a-half years in Holland and a couple more loans in the Championship.
"I want to prove myself in the Premier League so everyone can see what kind of player I am and what I'm capable of doing.
"I had a couple more offers from different coaches but I said no I want to stay in the Premier League."