The 19-year-old returned to Old Trafford following an unsuccessful loan at Sampdoria who were relegated from Serie A at the end of last season.
Earlier, the Italy Under-21 international told reporters he was ready to show he has improved as a player during his time away from United.
Yet, reports have linked Macheda with a return to Italy, with Sampdoria said to be keen so he can help with a promotion push next term.
But agent Giovanni Bia has excluded any move back to Italian soil.
“Federico is with Manchester United and he is very happy in England. I exclude his return to Italy,” Bia is quoted as saying on Sampdorianews.net.
Macheda failed to score during his short stint with Sampdoria.
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Agent rules out Italy return for Manchester United’s Federico Macheda