 Zárate featured in West Ham's 2015–16 UEFA Europa League qualifying campaign in pre-season, scoring his first goal of the season in a 2–2 draw at the Boleyn Ground against Romanian club Astra Giurgiu.West Ham eventually lost the tie 3–4 after a narrow second leg defeat.Zárate scored from outside the penalty area to conclude West Ham's 2–0 win over Arsenal at the Emirates Stadium in their opening match game of the 2015–16 Premier League season.