What a goalkeeping horror show! Winners & losers as Robert Sanchez and David Raya deliver disaster-classes in Chelsea-Arsenal thriller

Eyebrows were raised when Chelsea agreed to pay £42.5 million ($54m) to sign Palmer this summer given his lack of Premier League experience, but in his short Blues career so far it is looking like money well spent.

Starting as a 'false nine' between wingers Raheem Sterling and Mudryk, the England Under-21 international caused the Arsenal centre-backs nightmares, with neither William Saliba nor Gabriel Magalhaes sure whether to follow him into deeper areas or wait for him to enter the final third.

Palmer could have had a hat-trick on another night, but he will be pleased to have netted his second goal in as many games after converting from the penalty spot in the first half. That Enzo Fernandez ensured the ex-City man took the spot-kick rather than Sterling also shows the trust the 21-year-old's team-mates already have in him.

Both Chelsea and Arsenal chose to invest in new goalkeepers over the summer. Both turned to Premier League clubs further down the table to find those fresh No.1s. Both even decided that they wanted a Spanish 'keeper between the sticks.

Saturday's clash, however, only added fuel to the fire for those who believe neither team have invested wisely, as Sanchez and Raya delivered a disaster-class that leaves both their immediate futures in peril.

Raya is likely to come under the most scrutiny. After errors against Lens and Manchester United, pressure was already mounting on the man on loan from Brentford, and the way he conceded to Mudryk - flapping at the air as the ball looped over his head from out wide - left much to be desired. He almost compounded the error when he passed the ball straight to Palmer not long after, and was lucky to get away with the mistake in distribution. With Aaron Ramsdale waiting in the wings, this isn't something that can be allowed to continue much longer.

Sanchez, meanwhile, doesn't have the same level of competition breathing down his neck in west London as his compatriot does in the north of the capital, but he is failing to inspire much confidence, and his costly mistake here will not have improved matters. Those who questioned quite why Brighton's third-choice goalkeeper was being brought in to start continue to be vindicated.

There's no getting away from it - Arsenal were very fortunate to escape with a point from this one. Until the final 15 minutes, they looked toothless in attack and all over the place in defence. It was the kind of performance that has barely been seen since the start of last season by Mikel Arteta's side.

That they came away with a draw, though, was largely down to their manager and the in-game changes he made. Yes, they were given a helping hand by Sanchez for Rice's goal, but they took full advantage, with their bench players to the forefront.

Oleksandr Zinchenko was given a torrid time during the first half by the electric Sterling, as the Arsenal left-back struggled to combine his defensive responsibilities with his job of moving into midfield when the Gunners have possession. To his credit, Arteta swallowed his pride and replaced Zinchenko with the more natural defender Takehiro Tomiyasu at half-time. Perhaps unsurprisingly, Sterling was much quieter after the break.

Further forward, Arteta was forced to throw caution to the wind in looking to find a way back into the game, throwing on all four of Eddie Nketiah, Emile Smith Rowe, Kai Havertz and Trossard, with the ineffective Gabriel Jesus and out-of-sorts Martin Odegaard among those replaced.

It was Trossard who grabbed the headlines with his equalising goal, but Havertz played a small part in the move that led up to it, while the energetic Nketiah twice went close to netting a winner. Arsenal invested over the summer to ensure they had better squad depth in 2023-24, and that paid dividends here.

One of those replaced in the closing stages, this was a display from Odegaard that must be up there as one of his worst since his arrival at the Emirates Stadium. The Arsenal captain was wasteful in possession and seemed to be lacking energy amid the torrid conditions.

This isn't something to be overly concerned with - most who started in Arsenal red had off-nights and seemed to struggle with Chelsea's system and pressing - but it was provided a blueprint for future opponents as to how and limit the Norway star's influence.

It might not have ended with a win, but Pochettino must be pleased with how his team performed, especially with the limited preparation time following the international break and the litany of injury problems that he has had to deal with.

Coming off the back of two away wins, the Blues were in confident mood from the off, and more than deserved the 2-0 lead they had built inside the first 50 minutes. They were full of energy, incisive with their passing and dribbling, and strong in defence. Their formation was bamboozling Arsenal, and they looked well on their way to a comfortable victory.

That they didn't see it out can't be blamed on Pochettino, regardless of how much influence he had on deciding Sanchez was of sufficient quality to be the club's No.1 goalkeeper. The ex-Tottenham boss is clearly beginning to get his ideas across at Stamford Bridge, and despite their poor start to the season, a top-four push now looks like a realistic possibility.

It might seem harsh, but Noni Madueke really could have done with not allowing Bukayo Saka to cut inside and deliver the cross that led to Trossard's equaliser so easily. Doing so means we probably won't be seeing much of him in future weeks.

Despite their lengthy injury list, Madueke has been out of favour under Pochettino so far, but was thrown on for the closing stages as the Blues looked to see out the game after Rice pulled one back. Given the chance to impress, the apparent lack of effort when Saka picked up the ball by the corner of the box wasn't great to see.

If Pochettino agrees, then the former PSV winger might have to keep getting used to sitting on the bench for the foreseeable future.