Wales captain Jac Morgan and hooker Dewi Lake will join Gloucester at the end of the season.
The 25-year-old flanker's contract with the Ospreys was coming to and end and, with the region rumoured to be the one that will be cut by the WRU in 2027, it was expected he would not renew.
Morgan has been at the Swansea based region since 2021, when he made the move from boyhood club the Scarlets.
Gloucester have become a home for Wales players in recent years, with club captain Tomos Williams and centre Max Llewellyn currently plying their trade at Kingsholm.
Morgan told Gloucester's website: "I'm delighted to sign for Gloucester Rugby ahead of the 2026-27 season.
"It's a great club with brilliant supporters, I know a lot of players at Gloucester who speak highly of the environment and I'm excited for the future.
"I'm also looking forward to the challenge of playing in the Gallagher Prem."
The 105kg forward has made 24 Wales caps, scoring seven tries, most recently in the defeat against Argentina, in which he dislocated his shoulder in the act of scoring.
Morgan was one of only two Welsh players selected for last summer's British and Irish Lions tour, alongside Williams, who later withdrew with a hamstring tear.
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He played in the second and third Tests, scoring a try in the third Test in Sydney.
Morgan is joined at Kingsholm by Wales hooker Dewi Lake, with the 26-year-old leaving his boyhood club the Ospreys alongside his captain.
Lake has played 71 times for the Ospreys and 22 times for Wales and is another major coup for Gloucester.
Speaking on securing the signings of Morgan and Lake, Gloucester director of rugby George Skivington said: "With Dewi and Jac coming in, we've significantly bolstered our pack, adding to the talent that's already here, and we're shaping up nicely for the start of the 2026/27 season.
"[Jac is] a genuinely world-class rugby player and has a big impact in every team he's been a part of, and that's a really exciting prospect.
"Jac no doubt had lots of offers on the table, so for him to commit to the project here at Kingsholm is a great nod to the programme we have in place, and the ambition we have for next season and beyond.
"Dewi is the epitome of a modern-day hooker, dominant at set piece and industrious around the park.
"He's a gritty and abrasive player, and I know that's what fans like to see in a Gloucester player. I think they'll take to Dewi really quickly."