Ex-Manchester United man Roy Keane aims dig at Chelsea defender David Luiz and accuses him of being 'lazy and letting his team-mates down' after conceding penalty

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Former Manchester United midfielder Roy Keane is well-renowned to take no prisoners when he's sat in the punditry seat.

In fact, when he's sat in any seat. The latest victim to come under fire from the rough-and-tumble Irishman is Chelsea's David Luiz. 

Keane made a ruthless assessment of the Brazil international and labelled him 'lazy' after he conceded a penalty in their Champions League clash with Atletico Madrid, which Antoine Griezmann converted, just minutes before the interval.  

Roy Keane has lashed out at Chelsea defender David Luiz after he conceded a penalty 

'It's madness really. It's a form of cheating,' he told ITV.

'Why he's doing it is beyond me. He's lazy and he's letting his team-mates down. He knows himself. There's no need. We see a lot of that going on, so I'm glad he got punished for it. It's a form of cheating.'

Keane did not stand alone in his evaluation of the incident and was supported by former United team-mate Rio Ferdinand. 

The Brazil international found himself the wrong side of Lucas Hernandez and pulled him down

The referee should no hesitation pointing to the spot and brandished a yellow card

Griezmann tucked home the penalty to give the home side a lead to take into the break

Luiz looked dejected after Atletico scored the opener just before half time due to his error 

Ferdinand told BT Sport: 'David Luiz has left himself and his team-mates down here. You see he's the wrong side, he knows he's the wrong side and he gets a handful of the shirt and the referee is in a great position. He doesn't even protest.'

Antonio Conte must understand by now that with Luiz, who is bold by nature and often reflects this in his play on the pitch, potential errors come with the territory.

The man he re-signed for Chelsea for £35million in the summer of 2016 had looked a transformed player under Conte last season and added a certain reliability and an unwillingness to take as many risks to his game.

Keane said: 'He's lazy, he's letting his team-mates down and I'm glad he got punished

Something that Conte valued, but it seems the unruly centre half has allowed his erratic ways to creep back into his game as this is the second time in a matter of weeks he has let his team-mates down following his needless red card against Arsenal in the Premier League.

Former Liverpool captain Steven Gerrard emphasised this and echoed the notions of Keane and Ferdinand. 

'It's the second time in a week he has let his team-mates down (after) getting the sending off at Stamford Bridge last week,' he told BT Sport. 

Keane's former Manchester United team-mate Rio Ferdinand agreed with his assessment

Steven Gerrard also weighed in and highlighted that was his second mistake in a few weeks

'This is a moment of madness at a time when Chelsea were totally dominating this game and looked likely to make the first breakthrough.'

Fortunately for the Chelsea defender, though, this is the second time in a matter of weeks he has made a glaring error but it has not ended up a costly one. 

Conte will certainly consider himself lucky his side managed to overturn the one-goal deficit and earn a vital victory. Especially considering getting the lead and then defending it is what Atletico do best.

But as the Italian manager reflects on an overall positive night he will undoubtedly be concerned by Luiz's recent displays and will need him to improve and stop making so many mistakes, or on another day it could prove much more disastrous.

Antonio Conte will be pleased with the end result but will need to address the Luiz situation