Chelsea head coach Enzo Maresca urged his team to stop "giving away presents" after they received a second red card in as many games to lose 3-1 to Brighton in the Premier League at Stamford Bridge.
They were leading through Enzo Fernández 's first-half header when Trevoh Chalobah was dismissed for a poor tackle from behind on Diego Gómez , denying a goalscoring opportunity and leaving his team-mates to improvise their way through most of the second half.
Maxim De Cuyper 's header put Brighton into the lead at the start of 11 minutes of stoppage time to stun the home side.
The substitute was left unmarked to nod the ball home after Mats Weiffer had turned Yasin Ayari 's deep cross back into the box. Fellow substitute Danny Welbeck added a third -- his second -- to finish