With Manchester United also enthusiastically, Milan has taken a first step for the Ecuador International.
Sky Italia says that Milan's offer was rejected by Brighton.
Although the offer has not been revealed, it is clear that there is room for Milan to make an improved proposal.
The Ecuadorian contract with Brighton runs until the summer of 2027.
It is said that Brighton is looking for £ 40 million to sell Estupinan, with a first united offer soon expected.