Goals from Fernando Torres, Steven Gerrard, Fabio Aurelio and Andrea Dossena inflicted the biggest home defeat on the current English, European and World champions' since a 4-1 loss to QPR at the Theatre of Dreams in 1992, cutting their Premier League lead down to four points.
However, the Frenchman still believes Sir Alex Ferguson's side - who have a game in hand over their nearest challengers - will still lift their 18th league crown at the end of the season, saying the margin of Liverpool's victory was not a fair reflection on the overall game.
“There are two things I would like to say about that game,” he told the club's official website.
“Firstly, congratulations to Liverpool for winning with an emphatic score, but I think overall it is a very flattering result.
"For big spells in the game Manchester United dominated but they made mistakes on the day that usually they don’t make. Some players looked a bit mentally tired.
“It opens up the race for the title but I still believe that Manchester United are in a strong position with that game in hand. However they have played many matches since Christmas and it looked to have caught up with them on Saturday.”
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