The former Arsenal goalkeeper is being eyed by Nottingham Forest, Wolves, Hull City and Middlesbrough.
Middlesbrough's interest would be most controversial given Mannone plays for one of their north-east rivals.
Mannone impressed early at Sunderland after signing in 2013, but was dropped after a run of terrible form last October.
This culminated with a 8-0 hammering at the hands of Southampton, which led to the goalkeeper offering to refund fans for their travel expenses, as reported The BBC.
Unable to dislodge Costel Pantilimon since Dick Advocaat replaced Gus Poyet, a fresh move could be best for 27-year-old Mannone to relaunch his career.
Arguably the side most in need of bringing him in are Nottingham Forest, who have tried all summer to sign competition for Dorus de Vries.
They are though limited by a transfer embargo permitting loans only and restricting wage payments to £10,000 per week.