Sir Alex Ferguson is refusing to get carried away despite seeing Manchester United return to the top of the table following Sunday's 1-0 victory at West Ham United.
Ryan Giggs' decisive 62nd minute strike at Upton Park sent the champions back to the summit with a two-point advantage over second-placed Liverpool.
But despite also holding a game in hand on their nearest rivals, Ferguson has warned against complacency.
He said: "Mistakes can be made. We had an 11-point lead over Arsenal in 1998 and lost the league, so we are not counting our chickens.
"We shouldn't either because this game can come and bite you.
"This is a fantastic result and performance. It is time to kick on."
Meanwhile, Ferguson reserved special praise for his defence and Edwin van der Sar after the veteran Dutch goalkeeper claimed a British record for the longest amount of time without conceding a league goal.
"For Manchester United, over 20 hours without conceding a goal is extraordinary because normally we get scorelines like 4-3," he continued.
"It is great credit to the players. I am very proud of them.
"The record is a great motivation for the players, particularly Edwin.
"He has everyone jumping out of their skin at the moment."