The Red Devils announced the agreement on their website today.
A press release read: “United is pleased to announce it has reached an agreement with Partizan Belgrade and the players for Zoran Tosic and Adem Ljajic to join the club.
“Tosic, 21, will sign with immediate effect and wear the no.14 shirt, while an agreement is in place for 17-year-old striker Ljajic to remain with Partizan for the rest of 2009.”