Ibrahimovic's future at Inter has been the subject of constant speculation all summer, with the player hinting he could be ready for a new challenge having claimed interest from Chelsea on Sunday.
The 27-year-old recently spoke of his happiness at Inter and Ibrahimovic's representative Mino Raiola insists there has been no offer from United.
"There is absolutely no truth that Manchester United have bid for Zlatan," Raiola told skysports.com.
"If they did bid they did without me knowing and without Inter knowing.
"Zlatan is calm, he has a four-year contract at Inter. He is happy at Inter and is not thinking of moving."