Adam Jones is leaving Cardiff Blues to join Harlequins at the end of the season.
The former Wales and British and Irish Lions prop has signed a deal with Quins who are eighth in the Premiership.
The 34-year-old retired from international rugby in January after being left-out of Wales' squad for the Six Nations Championship.
Jones joined Blues in August 2014 after spending more than 10 seasons with Swansea-based Ospreys.
He penned a one-year deal at the time, but it is understood it will not be extended.
Harlequins have secured his services from the start of the 2015-16 season.
Since his switch to the Blues, he has been undisputed first choice tight-head, making 20 appearances so far this season.
Jones has played in 100 Test matches, made up of 95 for Wales and five for the British and Irish Lions.
The ex-Neath player became an Osprey when they were formed for the launch of regional rugby in 2003 and stayed with the region until signing for the Blues in August.
Jones is expected to be involved in Blues' Pro12 match in Ulster on Friday, as will most of their returning Wales Six Nations players.