On 7 May 2015, in a game in which he featured as right back until Coke entered the field in the 58th minute – he was often used by manager Unai Emery in that position during the campaign– Vidal scored twice and also provided an assist to Kevin Gameiro, in a 3–0 home win over ACF Fiorentina in the semi-finals of the UEFA Europa League. He started in the final 20 days later, a 3–2 defeat of FC Dnipro in Warsaw.