The former Liverpool star believes the Portuguese midfielder's dominance could have an adverse effect on the Red Devils
Manchester United have been so reliant on "fantastic" Bruno Fernandes that it can lead to inconsistent results and performances, according to John Barnes.
Fernandes has made an incredible impact for United since signing from Sporting CP a year ago and was on Friday named Premier League Player of the Month for a fourth time.
That was the first occasion any player has won the award four times in a calendar year.
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Fernandes will again be central to United's chances as they travel to Anfield to face champions Liverpool on Sunday holding a surprise three-point lead at the top of the table.