Seck won the last of his six caps in 2005

The 28-year-old Senegal international defender has been capped six times by his country.

Seck has not played for the Blades' first team since arriving at Bramall Lane almost a year ago.

He was named as a substitute in Scunthorpe's 2-2 draw with local rivals Barnsley on New Year's Day, but remained on the bench.