West Ham United are interested in Arsenal midfielder Fabio Vieira. The club has added him to their shortlist as part of a tactical shift under new manager Graham Potter. Vieira spent last season on loan at FC Porto, where he had 11 goal contributions in the league. He is not in Mikel Arteta's plans for Arsenal's refreshed squad. A permanent deal could be structured with a loan-to-buy option to manage Financial Fair Play considerations. West Ham have not yet approached Arsenal formally.