Sunderland's manager Peter Reid signed Arca in 2000 from Argentinos Juniors with a £3.5 million five-year deal, while holding off competition from Newcastle United and Leeds United. It came after when Peter Reid spotted him in an U21 match playing against England at Craven Cottage and tracked him until completing the signing in July 2000. Upon joining the club, Arca was Reid's most expensive signing of that summer and was then second only behind Stefan Schwarz as the club's record buy. The youngster was tipped for the brightest of futures and full international honours in the near future.