The Red Devils were linked with a move for the Portuguese central midfielder.
However, they chose not to make a big money offer to Sporting for their star man.
According to the Daily Mail, United felt that Fernandes took too many risks in possession.
Despite his playmaking prowess, Fernandes is often the player with the most giveaways for his team.
And United manager Ole Gunnar Solskjaer wants players who are calm and composed on the ball.