The 23-year-old joined United from Benfica’s rivals Porto in 2207. The youngster has made an impressive start to the Premier League season and scored against Tottenham last month.
He said: “The season has been great for me so far.
“It is very special to play here as a former Porto player. Benfica are stronger now than when I played in Portugal for Porto.
“They are growing and are more experienced. The coach is very good so they will be difficult to beat.”
