With captain Nemanja Vidic set for Inter, and Rio Ferdinand and Patrice Evra out of contract at season's end, United are in need of defensive reinforcements.
Although United are without a manager following David Moyes' sacking on Tuesday, club officials have identified the 20-year-old Bosnian left back as a transfer target, along with Southampton young gun Luke Shaw.
And Kolasinac, who is the latest Schalke starlet to be linked with a move away from the Bundesliga outfit, said he is considering an offer from the fallen Premier League champions.
"Yes, I have offer from Manchester United," Kolasinac told Bosnian newspaper Dnevni Avaz.
"But, I will not hurry with the decision (over my future). I have to see what Schalke think about it."
The Bosnia-Herzegovina international has made 22 league appearances for third-placed Schalke this season as Jens Keller's men aim to secure automatic qualification for the UEFA Champions League.
Kolasinac has quickly forged a reputation as one of the Bundesliga's most talented youngsters after making his debut for Schalke in a 2-0 win over Greuther Furth in September 2012.
The German-born defender, who can also play in midfield, also made his international debut for Bosnia-Herzegovina in the nation's friendly against Argentina in November last year.
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