Joe Cole said Chelsea look fatigued in the second-half of their 2-1 defeat to Wolves on Tuesday evening.
The Blues had taken the lead through Olivier Giroud, but lost thanks to goals from Daniel Podence and a stoppage time winner from Pedro Neto.
After an impressive run of form, Chelsea have now lost their last two Premier League games including a 1-0 loss to Everton at the weekend.
After the match, BT Sport pundit Joe Cole said that Wolves looked the fitter team as the match reached its final stages.