After regularly playing as a number nine in his first full season at Wolves, Cunha developed into an attacking midfielder during his second year at Molineux.
Playing as a left-sided number 10 last term, Cunha often dropped deep to retrieve possession.
Former Wolves coach Edu Rubio said: “He needed some time to adapt to English football but now he is showing his true quality.
“Cunha can help United to get the ball up the pitch quicker with his great dribbling skills and his excellent driving runs which can break opposition lines so effectively.
“He is a top player with great technical ability. He can play as an eight, as a 10, second striker, striker – so he fits very well in Ruben’s 3-4-2-1 system.
“He also likes to gravitate to the flank and come inside to hurt the opposition by penetrating into the box with and without the ball.
“United will need to offer him some freedom at front, giving him the opportunity to rotate and exchange positions across the attacking lines.
“In return he can offer United an attacking threat and hard work off the ball too.”
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