Fabricio Coloccini today left Newcastle United after eight years at the club.
Coloccini – who had been captain for the past five years – has had his contract "terminated by mutual consent".
The 34-year-old will join San Lorenzo in his native Argentina.
United managing director Lee Charnley said: "It is rare in football these days that a player gives such length of service to one club, and I would like to thank Colo for his contribution to Newcastle United since he joined us before the start of the 2008-09 season.
"In the eight years he has been with us, Colo has become a firm friend and colleague to many players and staff, past and present, who I know will miss him. We wish him all the very best for his future career."
Coloccini made 275 appearances for Newcastle in all competitions, scoring seven goals.