Chelsea face Liverpool in their second-leg Champions League quarter final tie on Tuesday at Stamford Bridge, having won the first leg 3-1 at Anfield.
With presumably one eye on that game, Hiddink withdrew goalscorers Frank Lampard and Didier Drogba with 20 minutes remaining, but the Chelsea manager insisted the substitutions had not prompted his side's mini-collapse.
"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."
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