In the 2017-18 Chelsea F.C season , Chelsea 's draw against Atletico caused Atletico 's failure to progress to the knockout stages of the Champions League for the first time since they failed to qualify outright in 2012-13 .
On 9 December , Chelsea 's unbeaten league run since October came to an end after they lost 1–0 to West Ham United at the London Stadium .
2017–18 Chelsea F.C. season