Omar Federico Alderete Fernández is a Paraguayan professional footballer who plays as a defender for Sunderland, a club competing in the English Premier League, and the Paraguay national team. Primarily a centre-back, Alderete is known for his physical presence, aerial strength, and composure in defense, while also being capable of operating as a left-back when required. At club level, he contributes to organizing the back line and building play from defense, and at international level he is a regular option for Paraguay in competitive matches and tournaments.