Benfica have reached agreement with Manchester City for the sale of Portugal defender Ruben Dias and signing of Nicolas Otamendi.
The Portuguese club have announced Dias will join City for a fee of €68m with Argentinian centre-back Otamendi moving in the opposite direction for €15m.
Both deals are subject to the agreement of personal terms at their prospective clubs.
A communication from Benfica announced the club had reached two agreements with City.
It read: "In the first statement, it said (Benfica) had reached an agreement with Manchester City for the sale of all the rights of central defender Ruben Dias for the amount of €68m, plus an additional amount of €3.6m, depending the achievement of goals related to the English club's sports performance.
"The said agreement is dependent on the signing of the player's sporting employment contract with Manchester City.
"In the second statement, (Benfica) said it had reached an agreement with Manchester City to acquire the full rights of central defender Nicolas Otamendi for the amount of €15m.
"This agreement is dependent on the signing of a sports employment contract with the player and medical examinations."