Ruben Amorim admitted Manchester United need to change after a dismal 4-3 defeat at Brentford on Sunday underlined the problems facing the Old Trafford boss.
Kevin Schade scored twice at Gtech Community Stadium as Uniteds miserable Premier League campaign took another blow, with their winless league run stretching to six matches.
Amorim made eight changes to his starting line-up as he rested key players after Thursdays 3-0 win at Athletic Bilbao in the Europa League semi-final second leg.
Fielding the third youngest starting line-up in Premier League history with an average age of 22 years and 270 days Uniteds raw rookies were unable to avoid a 12th defeat in Amorims 24 league games.
Since replacing the sacked Erik ten Hag in November, Amorim has been unable to lift United out of the mire.