The Argentina international joined United for a British record fee of £59.7 million (€82m) from Real Madrid last summer, but struggled to replicate the form he showed in the Spanish capital during his first campaign in the Premier League.
His poor performances and good displays from Juan Mata and Ashley Young meant he did not start a Premier League match after March 4, leading to reports linking him with moves to Paris Saint-Germain and Bayern Munich.
But Di Maria is hoping to return to his best following the Copa America, and plans to be playing under Louis van Gaal rather than elsewhere.
"I have just finished my first season playing for Manchester United," he told The Sun.
"It was a hard season for me. I think it was hard because it was another country and another league, and this league is harder than the Spanish one. So, I couldn't adapt myself as I wanted to.
"Now I will play the Copa America and then I will move back to Manchester for next season and do my best there."