Sheffield United manager Neil Warnock has signed Senegalese defender Mamadou Seck and Jamaican striker Luton Shelton on a busy day at Bramall Lane.
Seck won the last of his six caps in 2005
As well as the two new arrivals, Neil Shipperley, who has not played this season, has had his contract terminated by mutual consent.
Seck, 27, signed a two-and-a-half year deal after a free move from Le Havre.
Shelton, 21, cost around £2m from Swedish club Helsingborg, subject to receiving international clearance.
Shelton is an international team-mate of Blades defender Claude Davis and has scored one goal in four appearances for Jamaica.