The Portuguese has been below his best and has been sent off twice this season (one card was rescinded).
While the 30-year-old enjoys time away from United on international duty, he spoke about his club form.
"As for the club, I want to improve as soon as I get there and make sure the goals start coming again," Fernandes told Portuguese media.
"I have to take responsibility for that, too, because I'm a midfielder who scores a lot of goals.
"Over the years, I've always been at a very high level in terms of goals, and I have to live up to that, with those expectations.
"I also have my own standards, I don't hold back on that. I haven't scored for the club yet (this season) and I hope that as soon as I get there I can score and help the club get back to winning ways and to a good level."