"You can see the solidity and vision he has brought to the Connacht backline," said Warriors head coach Sean Lineen.
"He's a little bit older and with so many Scottish youngsters in our squad - which is good - and others hoping to be at the Rugby World Cup throughout September and October, we need an older head in the midfield. A bit of maturity and experience is what we need.
"He knows the game and has plenty Magners League experience. He's a top lad and is very ambitious so I know he'll make a difference."