Gloucester have signed Argentina Test lock Mariano Galarza from Worcester.
Galarza, 27, who has won 18 caps for the Pumas and was part of the 2011 World Cup squad, will join at the end of the season.
"Our search for second-rows has been detailed," Gloucester rugby director Nigel Davies said.
"We are delighted to have secured Mariano's services, as his qualities will complement the players we already have in place and give us some genuine options in the second row.
"I believe this gives us plenty of strength in depth in a hugely important area of the squad as we seek to establish a powerful forward platform for next season.
"Mariano is an experienced, physical operator and his signing is another statement of intent for us."