Man Utd boss Ruben Amorim grilled by Wayne Rooney over tactics in new low

has delivered a blistering critique of tactics under following to on Sunday. Amorim's selection of a youthful squad backfired as his team suffered their 16th defeat of the season.

Brentford surged ahead with a 4-1 lead before United managed two late goals to narrow the margin, yet it was another disheartening result for Amorim and his squad. Their winless streak in the league now extends to six matches, leaving them languishing in 15th place in the table.

With the Europa League semi-final second leg against Athletic Bilbao looming, Amorim made eight changes and selected the third youngest starting lineup in Premier League history.

The inexperienced trio of Chido Obi, Harry Amass, and Tyler Fredricson were given chances but failed to make a positive impact.

Nonetheless, United icon Rooney reserved his sharpest criticism for Amorim and the senior players on the pitch.

Appearing as a pundit on Match of the Day 2, the former Derby County, DC United, Birmingham City and Plymouth Argyle boss criticised Kobbie Mainoo for "switching off" for two of Brentford's goals.

He also slammed Amorim for misusing substitute Amad Diallo at right-wing-back and assembling a "disjointed" team that exerted "no pressure on the ball" and showed a lack of intensity.

Danny Murphy added: "It is about intensity, but with wingbacks, different to a back four, it allows you to go and press because you've got the extra centre half behind you.

"But surely that's what they do in training, no? If you're a coach of a system - the basics of this system with wingbacks is they press the wide men quick, and it doesn't look like they're doing it. It's bizarre for me to see."

Rooney responded: "It's strange, because that's why you play a back five with wingbacks. They have to put pressure on the ball, or otherwise you get outnumbered in the midfield and the ball comes back into midfield. It was strange, but they had a lot of young players.

"There was a lack of movement and a lack of know-how on the pitch. They've got a 17-year-old lad up front - the youngest ever to start up front for United - and they're just launching balls up to him.

"I really felt for Obi today because you can tell he's inexperienced, but it looked like he had no help; they were just throwing balls up to him."

Murphy continued: "I get that there are young players, I understand that, and they're playing against good teams.

"But he [Amorim] only plays one system, he's not mixing things up, personnel and system, and he's been there a while now.

"When you play a system that much and you work on it in training, surely we can see more improvement, irrelevant of who is playing, because they should be organised in that system."

Rooney weighed in further: "You'd think so, but I think the second team are playing a back four, which I found strange.

"Because those players who are coming into the first team now with the under-23s or under-21s are playing a different system.

"For me, that's a bit confusing. Getting to the Europa League final is papering over a lot of cracks for Manchester United, and that needs solving quickly."