Fred received multiple comments on his most recent Instagram post (from Thursday) after being at fault for Leicester’s first goal in the 3-1 defeat at the King Power Stadium.
His backpass sold goalkeeper Dean Henderson short as United tried to play their way out of defence, with Kelechi Iheanacho taking full advantage to open the scoring after 24 minutes.
It is just the latest in a series of abuse directed at Manchester United players in recent weeks after Anthony Martial was racially abused on social media following the 1-1 draw away to West Bromwich Albion in the Premier League on February 14.
Martial played 66 minutes before being replaced by Mason Greenwood as United came back to level against West Brom after going behind inside two minutes.
It comes after Martial, along with team-mate Axel Tuanzebe, was abused after the team’s loss to Sheffield United on January 27, while Marcus Rashford also posted a statement about comments directed at him in late January.
Meanwhile, Sky Sports News have contacted both Instagram and Manchester United for a response, with the latter saying they are aware of the abuse.