The agent of Benfica midfielder Nemanja Matic isn't surprised by interest from Manchester United.

United registered their interest in Matic with Benfica last month.

"With how Matic is doing it is normal that clubs are interested in him," Matic's agent, Dejan Mitrovic told A Bola.

"It is amazing how his game has developed and how he plays in every game; so many clubs want to watch a player like him.

"At Chelsea he never had any good opportunities and he is now feeling well at a big club like Benfica."