"And it was a real concern, what happened in the first half".
Gary Cahill and Cesc Fabregas were sent off as the Blues became the first reigning champions in Premier League history to concede three goals in their opening fixture.
Antonio Conte has already signed Antonio Rudiger, Alvaro Morata and Tiemoue Bakayoko this summer - but with Nemanja Matic, Nathan Ake and John Terry leaving, and Diego Costa unlikely to play for the club again - there remains work to be done.
Having made only four new signings and allowed a host of players to leave either on loan or on permanent deals, Chelsea's squad already looks desperately thin. Conte had to draft youngster Jeremie Boga into his starting line-up against Burnley, while rookie quartet Kenedy, Charly Musonda, Kyle Scott and Fikayo Tomori were named on the bench.
It is not just Conte who wants new additions to arrive at the Bridge as defender Cesar Azpilcueta demanded more signings, following their disappointing defeat on Saturday.
"When you see the players we lost, and the players we have signed in, they are not the same", Azpilicueta told reporters.
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"I think it's affecting Conte, the way he's behaving, the way he's responding and reacting", said former Chelsea goalkeeper Mark Schwarzer.
United and City look particularly threatening having significantly strengthened in the transfer market after their struggles last season, and Chelsea will be aware that recovering from a slow start might be more hard this time around.
"So we need players".
"In this instance, he hasn't, so it just seems that there's a very unhappy camp at the moment".
With the spotlight firmly on Chelsea, and Conte in particular, developments over the next week could have a significant bearing on how the season maps out. "I still can't believe Chelsea have let him go", said Sky Sports pundit Gary Neville on Sunday.
"It's important for me that we don't close our eyes, but to focus on our mistakes, to work and to improve".
"We have to give all of ourselves, to try to put in 120 percent, every single person".
"The same goes for my staff and for me".