Joe Cole has said Chelsea appeared to be hindered by fatigue in Tuesday's 2-1 defeat at Wolves.
The Blues went ahead early in the second half through a goal from Olivier Giroud but squandered their lead in the last 20 minutes of the match, as Daniel Podence's effort took a deflection before evading Edouard Mendy for the equaliser.
Pedro Neto then sealed the three points for the hosts when he latched onto a pass from substitute Vitinha before smashing into the bottom corner deep into stoppage time.
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The defeat was the London side's second in a row in the league, having gone down 1-0 at Everton on Saturday.