Transfers
The 27-year-old former Arsenal player is manager Pierre Sage's second signing of the summer transfer window, following the arrival of defender Oscar Mingueza.
Tomiyasu, capable of playing at full-back and centre-back, spent the second half of last season at Dutch giants Ajax.
The defender, who has won 46 caps, was part of Japan's squad at the 2026 FIFA World Cup.
South London club Palace have enjoyed a golden spell over the past two seasons, winning the FA Cup, Community Shield and UEFA Conference League under former manager Oliver Glasner.
"I'm excited to get started," said Tomiyasu. "This club is in a good moment, winning three titles in two seasons. Here is where I wanted to be."
Elsewhere, Al Ittihad Club - who will play against Al Jazira SC in the AFC Champions League Elite 2026/27™ Preliminary Stage on Tuesday - bid their goodbye to Fabinho.
The Brazilian midfielder is leaving at the end of his three-year contract, where he helped the club to a league and cup double in the 2024/25 season.
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