The 21-year-old Serbia winger has yet to make an impact after joining United from Partizan Belgrade in January. This season he has made a solitary first team appearance as a substitute in a League Cup match.
"I am doing my best to break through at United but there are many good wingers in the squad and all I can do is keep working hard and take every given opportunity to play well," Tosic told Reuters on Monday.
"I am not thinking about a move away from United because I am confident that I belong here and that if I am patient enough, I will be able to prove my worth and eventually break into the first team."
He added: "It would be easy to lose faith, get frustrated and make a hasty decision to go to another club, but I have joined one of the three biggest clubs in the world and I don't want to spurn an opportunity to stay here.
"On the other hand, I have to keep in mind that I need more first team football to keep my place in the Serbia squad ahead of next year's World Cup finals in South Africa.
"Time will tell, but I definitely want to stay."
NO BAROMETER
Although Tosic has visibly improved from regular appearances for United's reserves, he knows he needs to be tested by the unique demands of the Premier League.
"The style of play is similar and the pace in the reserves is not too far behind the Premiership because there are a lot of hungry and fit young players looking to impress.
"But it's still no barometer because the gulf in class and quality between the two competitions is massive."
Serbia, who qualified for the 2010 World Cup from Europe's Group Seven ahead of 2006 finalists France, take on Northern Ireland and South Korea in friendlies. Tosic sees those games as an opportunity to impress coach Radomir Antic.
"Every game is a new chance for every player to improve his ranking in the squad, hence we will head into these friendlies as if they were competitive matches," he said.
