Boss Frank Lampard was disappointed his Chelsea players dropped their standards for the second time in four days to suffer a last-gasp Premier League defeat at Wolves.
Pedro Neto struck in the fifth minute of stoppage time to claim a 2-1 comeback win for the hosts.
Olivier Giroud opened the scoring for the visitors four minutes after the break before Daniel Podence’s deflected effort pulled Wolves level.
“We always mention character when things go well and then we forget when things don’t go so well the character is still there,” said boss Nuno Espirito Santo.
“Football is played until the last minute of the referee’s whistle but the character goes with the belief, commitment and support of each other. The rest is a game and situations can happen.
“When we work so hard like the boys did today we get our rewards. But happiness lasts for one hour and after an hour we are thinking about Burnley and how tough that is.”
Yet victory came at a price with Leander Dendoncker and Boly both suffering injuries.
Nuno added: “Let’s see what’s happening with Leander. At half-time he wasn’t able to proceed.
“Willy had a problem at the end and the doctors will see and we can say what’s really happening.”