Thomas Tuchel has conceded the shock 5-2 defeat against relegation-threatened West Bromwich Albion is a 'big wake-up call' for Chelsea ahead of their Champions League quarter-final against Porto.
The Blues saw the returning defender Thiago Silva sent off before the half-hour and the Baggies made hay against 10 men, with Matheus Pereira and Callum Robinson scoring twice and Mbaye Diagne netting once.
And the German admitted failure to adapt against Sam Allardyce's fired-up men cost his side.
He said after the match: After the red card we were not able to cope with the situation.