Chelsea dropped more points in their quest to climb back up the Premier League standings as Serge Aurier earned Nottingham Forest a 1-1 draw with Graham Potter's side on Sunday.
Fresh from their first league win in six games last time out against Bournemouth, Chelsea started well in the Nottingham drizzle, with Raheem Sterlng firing them into the lead in the 16th minute with his first league goal since August.
Forest improved after the break and were desperately unlucky not to equalize early in the second half as Morgan Gibbs-White's drilled half volley hit the underside of the crossbar but bounced on the goal line and away.
The hosts kept coming and deservedly levelled things up as Aurier slotted home his first goal for his new club in the 63rd minute, with Forest looking the more likely winner from there on in.
They could not complete the turnaround, with Chelsea hanging on for a point that leaves them eighth in the standings, seven points behind Manchester United in fourth.
The hosts remain in the relegation zone but climbed to 18th, level on 14 points with West Ham United above them.
Chelsea needed the reset that the World Cup gave them, given they had gone on their longest league run without a win, five, in 10 years prior to the tournament.
It appeared they had turned the corner after the Bournemouth win and their impressive start at the City Ground. They nearly broke the deadlock in just the second minute as Mason Mount fired over from a good position.
The visitors went one better through Sterling after Christian Pulisic's cross had looped onto the crossbar and England forward hammered home the rebound.
Chelsea continued to remain in control until the break, with Pulisic wasting a good chance to make it two just before the interval, firing straight at home goalkeeper Dean Henderson.
Brennan Johnson saw one first-half effort saved, but missed an even more gilt-edged opportunity early in the second period, firing too close to Chelsea goalkeeper Kepa Arrizabalaga from a good position.
Gibbs-White was causing Chelsea all kinds of problems, firing against the crossbar before playing a big part in Aurier's equalizer, curling over a corner the visitors could not clear and former Tottenham Hotspur full-back pounced.
Chelsea substitute Pierre-Emerick Aubameyang should have done better with a late header, but it would have been harsh on the home side, who more than warranted at least a point from the contest.