The 23-year-old Nigerian striker still has 3 1/2 years left of his current deal with the club.
Martins has been linked with Inter Milan, Arsenal, Aston Villa and Manchester City.
The former Inter star will earn £90,000-a-week from his new deal.
The 23-year-old Nigerian striker still has 3 1/2 years left of his current deal with the club.
Martins has been linked with Inter Milan, Arsenal, Aston Villa and Manchester City.
The former Inter star will earn £90,000-a-week from his new deal.
