The 26-year-old has earned six Scotland Test caps, featuring against Fiji, the Springboks and the Wallabies last November.
“I’m incredibly excited for this next chapter in my career,” Richardson said. “Moving to Scotland and joining a club with such a strong history and passionate support base is a massive opportunity.
“I’m looking forward to embracing the new environment, challenging myself both on and off the field, and contributing to the continued success of Edinburgh Rugby.”
Everitt’s influence was instrumental in Richardson’s decision to join Edinburgh, with the coach having guided him through his formative years at Kings Park.
“Coach Sean has played a significant role in my development as a player, and having the chance to work under his leadership again is something I’m really looking forward to,” said Richardson, who has made 60 appearances for the Sharks across all competitions since 2019.
“His belief in my abilities and his vision for the team made the decision to join Edinburgh an easy one. I have a lot of respect for him as a coach and as a person, and I’m excited to be part of what he’s building at the club.”
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Everitt added: “We’re thrilled to welcome a player of Dylan’s quality to Edinburgh Rugby. He’s a strong and dynamic player who brings plenty of experience from his time with the Sharks and his international appearances for Scotland. His versatility, being able to play both hooker and in the back row, will be a real asset for us.
“Having worked with Dylan previously, I’m very familiar with his game and I know he will be a good fit culturally. He fits the profile of the squad we’re trying to build here at Edinburgh, and we’re excited to welcome him to the club this summer.”
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