Alves joined Boro in a club-record £12million deal from Dutch side Heerenveen in January 2008, but failed to make an impact at the club.
The 28-year-old has signed a three-year deal with Al Sadd, who have paid Boro around £6million for the striker.
Alves joined Boro in a club-record £12million deal from Dutch side Heerenveen in January 2008, but failed to make an impact at the club.
The 28-year-old has signed a three-year deal with Al Sadd, who have paid Boro around £6million for the striker.
