Koln will sign the 22-year-old on a loan deal until the end of the season.
Tosic has failed to make an impact since joining United from Partizan Belgrade.
Sporting Lisbon, Olympiakos and Twente are also reported to be interested in the midfielder.
Koln will sign the 22-year-old on a loan deal until the end of the season.
Tosic has failed to make an impact since joining United from Partizan Belgrade.
Sporting Lisbon, Olympiakos and Twente are also reported to be interested in the midfielder.
