Graham Potter admitted Chelsea are still "a work in progress" after their winless Premier League run extended to three games as Joao Felix's first goal for the Blues was cancelled out by Emerson in Saturday's 1-1 draw at West Ham.
Potter's expensively assembled side once again failed to live up to their price tags as the pressure mounted on the Blues boss.
Portugal forward Felix put Chelsea ahead in his second appearance for the club, only for Italy defender Emerson to haunt his former team with an equaliser before half-time.
Ninth-placed Chelsea have won just one of their past eight games in all competitions and are nine points adrift of the Premier League's top four.
Chelsea, without a win in their last seven away league games, splashed out more than £300 million ($362 million) on new signings during the January transfer window.
Although Potter insists he is well aware of the pressure to get Chelsea back on track, the former Brighton boss has been unable to stop the rot and is certain to face further scrutiny about his position.
"The second half was more of a reflection of where we are in terms of integrating new players and getting players up to speed in the Premier League," Potter said.
"I think you saw the potential in the first half. You can't control what people say from the outside, you see it how it is and carry on working.
"They are a good group and we are excited with the team and the potential but it is still a work in progress."
The Blues face Borussia Dortmund in the Champions League last 16 first leg on Wednesday and Potter desperately needs to steer his team through to the quarter-finals to earn some breathing space.
Failing to beat lowly West Ham was another black mark against Potter, with the east Londoners sitting just two points above the relegation zone.