Head coach De Zerbi, who took charge in late March and led the club to Premier League safety on the final day after securing three wins, two draws and two defeats in seven matches, is enthusiastic about integrating the former Feyenoord star.
Assessing the free transfer, De Zerbi noted: "Marcos' experience, quality on the ball, and competitive edge will strengthen us defensively, as well as giving us flexibility in formation. He's comfortable playing in a possession-based team, reads the game very well and has the personality to thrive in a demanding environment."
Last term, the centre-back proved his immense worth by making 39 appearances across all competitions for Bournemouth, including 37 in the league.