“He has signed a contract until June 30 2023."
The Dutch Under-21 international also spoke to the website.
"It's the start of a new adventure for me, I really can't wait to get started and test myself in the Italian Serie A.
"It's a great opportunity for me, I can assure you I will give my best and I'll try to show my qualities and make my new fans proud of me.
"I've already come to Bologna twice in recent months, I discovered a beautiful city and I've already noticed the passion of the people.
"I'll return in late June with a huge desire to become part of the Rossoblu family."