Japan captain Wataru Endo was ruled out of the World Cup with injury and announced his international retirement on Thursday, three days before his team's opener against the Netherlands.
The Liverpool midfielder pulled out of the tournament after failing to recover from a foot injury, and was replaced in Japan's squad by Borussia Monchengladbach's Shuto Machino.
The 33-year-old Endo said on social media that he was "frustrated" at not being able to play but backed his team to impress in Group F, where they face the Dutch, Tunisia, and Sweden.
"There will definitely come a time in the future when Japan win the World Cup, so let's believe in that and support the team," he wrote on X.
"Let's bring the strength of Japan together so that that moment can happen at this tournament in North America."
He added, "I have decided to retire from the national team. From now on, I will be supporting Japan as just another fan."
Endo suffered a season-ending foot injury playing for Liverpool against Sunderland in February but returned for Japan in a 1-0 friendly win over Iceland in Tokyo on 31 May.
He came off at halftime and continued to feel discomfort at the team's pre-World Cup camp in Mexico, where he was not involved in any full training sessions.
He took part in training when Japan moved to their World Cup base in Nashville on Monday but was not able to get up to speed in time for the tournament.
"I've done everything in my power since I sustained the injury so I have no regrets," said Endo.
"Of course I'm frustrated that I can't play at this World Cup.
"But more than that, I'm proud that I've been able to captain this team since the Qatar World Cup and help it grow into a group where it feels natural to say our target is to win the World Cup."
Endo made his Japan debut in 2015 and retires with 73 caps, having scored four goals for his country.
He was a member of Japan's squads for the 2018 and 2022 World Cups, and played in their stunning wins over Germany and Spain in Qatar.
Defender Ko Itakura will take over as Japan's captain at the World Cup.
"Wataru is the one who will feel the most frustration at this," said Itakura.
"He has been a real leader for this team. I want to accept this role with a sense of responsibility and determination."
Japan have been hit hard by injuries heading into the World Cup.
Brighton winger Kaoru Mitoma was left out after injuring his hamstring less than a week before Moriyasu named his squad.
Monaco's Takumi Minamino also missed out after tearing the anterior cruciate ligament in his left knee in December.
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