Japanese Super Cup
Doi and Kashima added another trophy in 2017, winning the Japanese Super Cup after a 3-2 victory over 2016 runners-up Urawa Red Diamonds. Doi again was a key part of the team with 46 appearances and 5 goals across all competitions, almost winning back-to-back league titles if not for a final day 0-0 draw with Júbilo Iwata to lose out on goal difference. His performances earned him a national team call-up in 2017.