Manchester United defender Lisandro Martinez has launched a blistering attack on the club's hierarchy for not strengthening the squad following qualification for the Champions League.

Tuesday's 2-0 defeat by Atletico Madrid means the Red Devils have now gone five games without a win.

Former United players Wayne Rooney and Ashley Young were in Madrid for the game.

Discussing Martinez's comments on Amazon Prime, both said the defender had gone too far and the damage inside the dressing room could be significant.

"Something like that will rip that dressing room apart," said Rooney.

The former England and United captain recalled his own public criticism of the club in 2010 which drew a fierce response from boss Sir Alex Ferguson.

Rooney said it had been a mistake which he had apologised for.

"It is disrespectful to his team-mates," he said. "He is saying his team-mates aren't good enough.

"Bruno [Fernandes] is the only one with any right to say that. Behind closed doors, it happens - but that interview isn't going to help...

"[Martinez] has tried to speak on behalf of the players but done it the wrong way.

"It looks like a player trying to look after himself. It was very premeditated. It is sad because you need everyone to stick together, you need to be as one."

Youri Tielemans - who United bought from Aston Villa for ﾣ35m in July - also spoke to the host broadcaster but opted not to respond to the question.

Commentating on the game, and speaking before Martinez, former England striker Alan Shearer said he felt Michael Carrick had been let down.

Young feels Martinez should have kept his counsel.

"We know recruitment has to work and be better but players have to be better," he said. "They are the ones who have to produce.

"There's going to be no change now. That could create [issues] all week after what was a good performance."