Cardiff-born John, who is capable of playing at centre and across the back three, is understood to be a replacement for the departing Jack Walsh.
The 24-year-old joined the Chiefs’ academy in 2020 and went on to make his senior debut in March 2021, coming off the bench in Exeter’s win over Leicester Tigers.
The former Wales Under-20s cap made 33 appearances for the English Prem side in total.
“I’m really excited by the prospect of playing for the Ospreys,” John said.
“There are some quality players in the team and they play some exciting rugby, I think it’s somewhere that will help me take my game to the next level.
“I’ve spent so many years at Exeter and I’m incredibly grateful to the players, coaches and supporters for making my time at the club as good as it was.
“I’m looking forward to starting this new chapter of my career back in Wales, and I can’t wait to get started.”
Speaking on the signing, Ospreys head coach Mark Jones said:
“We’re really happy to have Dan joining up with us ahead of next season. He’s a versatile player that can affect the game from a few different positions and we think he’ll be well suited to the brand of rugby that we want to play at St Helen’s next season.
“It was important for us to not only add depth to our backline but to add quality where possible and Dan is someone that will definitely have a welcome impact on our options in the backline.
“As a club we place a high importance on developing Welsh talent, so this signing made a lot of sense for us on multiple fronts. We’re exciting to see how Dan progresses in an Ospreys jersey.”
[Lead image: Ospreys Rugby]
