Cardiff Blues have made eight new signings, including Wales forwards Gethin Jenkins, Robert Sidoli and Deiniol Jones.
Sidoli was wanted by the Ospreys and Sale
The Warriors trio are joined by ex-team mates Mark Lewis, Lee Thomas, Matthew Nutthall and Shaun James.
The final signing is Leeds Tykes and Wales A centre Tristan Davies.
Cardiff chief executive Robert Norster said: "The new signings all undoubtedly add to the growing balance that is developing within our squad.
"Taken as a group they offer a telling ingredient in our style of play."
The three Welsh internationals will be central to the Blues' ambitions, bolstering their lightweight tight five with the intention of supplying quality ball to their dangerous backs.
Jenkins, 23, is one of the most talented young props in the game, capable of playing either side of the scrum.
Sidoli is considered one of the few locks in Wales with world-class potential, whilst Jones has forced himself into the national squad after an excellent season.
Lewis (flanker), Thomas (fly-half), Nutthall (full-back / wing) and James (three-quarter) are considered four of the most promising prospects in Welsh rugby.
"All these players are exciting acquisitions for the Blues' regional squad," said coach Dai Young.
"They further underline our commitment to bringing strength in depth to our set-up and I am really looking forward to integrating them into what we have already.
"They will certainly benefit us both on and off the field."