London Welsh confirmed the signing of Brumbies back row Lachlan McCaffrey.
McCaffrey, 24, has also turned out for the Force and Waratahs in the Super 15, is English-qualified being born in Liverpool.
Head coach Justin Burnell said: “Lachlan caught our attention at the Cub 10s in Singapore when he was part of the Brumbies squad. I had the opportunity to meet him first hand and have a look at him play, and he really impressed me.
“He’s EQP and that’s very important, but he’s also got an excellent and proven pedigree in Super 15 rugby. He’s a typical ball playing Australian forward – he’s got a brilliant skill set.
“It’s another massive statement by London Welsh in our bid to compete in the Aviva Premiership next season.”