Marcelo Bielsa lambasted his Leeds United players after they suffered their heaviest defeat in the Premier League at Manchester City on Tuesday night.
Pep Guardiola's side were at their rampant best as they put seven past the visitors with no reply, though it could have been even more such was the volume of chances City had and the amount of times they cut Leeds open.
Following the defeat, a relegation dogfight now seems a genuine possibility for Bielsa's men.
Leeds sit just five points above the dreaded bottom three in 16th, although 18th-placed Burnley have two games in hand and could leapfrog them should Sean Dyche's men win both.
Asked for his thoughts on what he had just witnessed, Bielsa was scathing in his assessment, claiming it was the worst of his entire Elland Road tenure.
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"This is the worst performance in the four years," the Argentine explained. "At no moment were we able to balance the game. The sensation we gave off was that anything they attempted we couldn't prevent.
"It's not that City played very well - it's a lot more noticeable how badly we played than how well City played. City play like this all the time, or similar to it, but we have never played so badly in these four years.
"It was not good enough. There is nothing positive to take away from our performance. I can't find anything that can be of value.
"There is no justification I can offer, the game was exactly how we thought it was going to be.
"We prepared ourselves to avoid everything that happened and we didn't manage to get anything."
For Man City, the victory gave them some breathing room, albeit potentially only temporary, as they now sit four points in front of second-placed Liverpool having played one game more than Jurgen Klopp's men.
City's rampant form in front of goal also secured yet another record for boss Guardiola, Phil Foden's early strike ensuring City reach the landmark of 500 goals under Guardiola in just 207 games.
This marks the quickest amount of time any club has achieved this feat under a manager, beating the previous record held by title rivals Liverpool under boss Klopp, who reached the milestone in 234 matches.
Guardiola has previously spoken of his admiration for Bielsa, once claiming: "I would have liked to have played under him: he is different to everyone else, I think he is the best-prepared manager I’ve ever seen in my life."
