Nottingham Forest have signed Bologna captain Nicolas Dominguez on a five-year deal after taking Arsenal full-back Nuno Tavares on loan.
Forest's Swiss midfielder Remo Freuler went the opposite way to Dominguez, joining Bologna.
Argentina midfielder Dominguez, 25, said of his move: "It feels amazing to join a club with so much history."
Portuguese Tavares, 23, joined Arsenal from Benfica in an £8m deal in 2021 but now heads to the City Ground.
He spent last season on loan at Marseille, scoring six goals in 31 Ligue 1 games as OM finished third in the table.