In January 2018, Arguiñarena signed with Boston River.[6] That season he made 22 league appearances, scoring one goal.[4] On 25 July 2018, he made his continental debut in the Copa Sudamericana as an injury time substitute for Boston River in a 1–0 win over Argentinian club Banfield.[7]
Valour FC
Arguiñarena signed a multi-year deal with Canadian Premier League club Valour FC on 25 February 2019.[1] That season, he made eighteen league appearances and two appearances in the Canadian Championship.[4] In January 2020, Valour announced that he had been released from his contract.[8]