London Irish have moved to replace departing prop Faan Rautenbach by signing Ospreys tighthead Cai Griffiths.
South African Rautenbach will leave the Exiles this summer after seven years at the Aviva Premiership club.
And the Exiles have confirmed that 28-year-old Griffiths will be part of their squad for next season.
Griffiths made more than 100 appearances for the Swansea-based Ospreys, helping them to three league title successes.
"Cai is very solid at the set-piece, which is crucial when signing a tighthead prop," London Irish rugby director Brian Smith said.
"He is a direct replacement for Faan Rautenbach, who is leaving London Irish after seven years' service."