Chelsea boss Guus Hiddink says Bolton Wanderers gave them a "wake-up call" after their 4-3 victory.

Chelsea were 4-0 in front with just 20 minutes remaining thanks to a brace from Didier Drogba, a Frank Lampard penalty and Michael Ballack's first league goal of the season.

But Hiddink substituted Lampard and Drogba in the 65th minute and Chelsea then capitulated as Bolton scored three goals in nine amazing minutes through Andrew O'Brien (71), Chris Basham (74) and Matt Taylor (80).

And it required a clearance off the line by Deco in the final seconds to ensure Chelsea took all three points and remained in the title hunt.

"It was a wake-up call for us and we talked to the boys straight after the game," said Hiddink. "If you play at the top, you cannot afford to do it twice.

"We must not let it happen again. It is normal that the players react to the situation.

"It was a typical English game. We were leading 4-0 with 20 minutes to go and waiting for a fifth.

"All of a sudden we got very sloppy and too relaxed and didn't win any duels defensively.

"I am not just talking about the defence but also the midfield and front players. We conceded three goals in nine minutes I think - that should not be possible against a team that is near the top of the table.

"We did not perform well. There was a sequence of errors that we made.

"I don't think the substitutions were the cause. We were just too relaxed in the last 20 minutes."