The 27-year-old has been in talks with AC Milan for the past few days with the Serie A club in need of a replacement for Theo Hernandez, who joined Saudi club Al-Hilal.
According to Fabrizio Romano, an agreement has now been reached between Brighton and Milan for the transfer Estupinan.
🚨🔴⚫️ Pervis Estupiñán to AC Milan, here we go! Verbal agreement in place with Brighton after green light from Tony Bloom.
€17m fee plus €2m add-ons, long term deal for Pervis who’s set to become new AC Milan left back.
Formal steps to follow. 🇪🇨
The Ecuador international had made 36 appearances across all competitions last season.
Brighton have already managed to sign a replacement for Estupinan, signing Maxim De Cuyper from Club Brugge earlier in the summer.