Chelsea entered the London derby against West Ham having kept a clean sheet in their last four games – and winning all four as well – culminating in a 4-0 victory over Manchester United at Stamford Bridge over the weekend.
The Blues had not let him a single goal since switching to a 3-4-3 setup until Cheikhou Kouyate opened the scoring in the first half of the EFL Cup clash at the London stadium with a well timed head.
Kouyate ended a 10 match streak without scoring a single goal for the Hammers in the process.
The Blues may have conceded their first goal in four games but they still have the chance to keep their winning streak alive should they manage to make a comeback in the second half.
The East London based outfit went into half-time with a 1-0 lead against their cross-city rivals. The Hammers will extend their winning run to three games if they hand onto a win against Chelsea.