Colombian international has been strongly linked with a move away from the San Siro this summer with United, Tottenham and Russian side Russian outfit Anzhi Makhachkala all credited with an interest in the attacking midfielder.
However, Guarin's representative, Marcelo Ferreyra, insists the 26-year-old wants to stay at Inter.
"He wants to stay at Inter," Ferreyra told FcInterNews. "He is happy here and wants to become a champion with those colours.
"Manchester United, Tottenham and Anzhi are not part of our plans. We are not interested in joining other clubs.
"My player wants to win with Inter. Does the club want to sell him? That is not what I've
Another player who seems set to stay at Inter is Rodrigo Palacio after he rejected talk linking hiom with a move to Boca Juniors.
The former Boca star admits he would like to return to Argentina at some point in the future but that he is happy at Inter.
I'll remain a couple of years in Italy again and then I'll think to come back to Argentina", Palcio told Radio Vorterix in Argentina.
"I have still a two years deal with Inter.
"I felt in a really good way at Boca, even if I had few problems at the beginning.
"In big clubs you can't relax because you must win all games, otherwise it is a failure. What happened at Boca it's the same as is happening at Inter."
Meanwhile, reports in Italy suggest Inter are ready to cancel the contracts of long-serving duo Dejan Stankovic and Cristian Chivu.
Stankovic's agent met with Inter officials on Wednesday to discuss the player's future with reports suggesting he could be allowed to leave the club a year before his contract ends in a bid to save money on his wages.
Romanian defender Chivu could also be allowed to cancel his contract to free up funds to bring in new signings.