Tottenham Hotspur's defeat against Chelsea, their fifth in a row against the Blues, was undoubtedly the bleakest and most concerning result of Thomas Frank's reign so far.
The one-goal affair felt wholly different to Spurs' recent losses against their nemesis when led by Ange Postecoglou, but gone was any form of entertainment value this time, and the post-match reaction from fans and players underscored the issues that Frank contends with just a few months into his tenure.
Still, things aren't all that bad. Tottenham are fifth in the Premier League, just two points away from second-place Manchester City. Furthermore, they are unbeaten across three Champions League fixtures.
We were always going to see a bedding-in period, and Tottenham have put last season's lowly league form behind them, but there's much more to be desired all the same.
And in the case of Xavi Simons, it's probably fair to say that more would have been expected from the diminutive playmaker by this stage.
Xavi Simons' slow start at Spurs
When Tottenham signed Simons from RB Leipzig for £52m in August, they knew they had sealed a coup. After all, the Netherlands international had been courted by Chelsea all summer, with analyst Ben Mattinson claiming he is "destined for greatness".
But it's been a tough start to life in England, alright, and the 22-year-old has been one of the most saliently poor Spurs stars this season, with his performance against Enzo Maresca's side drawing plenty of backlash.
It's a collectively shared opinion within the Lilywhites fanbase that Simons has lacked composure and presence in his creative midfield berth this season. The Chelsea match was a defeat in isolation, but Sofascore record that Simons is averaging only 0.9 key passes per Premier League game this term, having featured seven times and started five of those games.
Having replaced the concussed Lucas Bergvall after only seven minutes at the weekend, Frank saw it fit to hook his summer recruit just over an hour later.
With Dejan Kulusevski and James Maddison both sidelined with injuries and still not expected back for the foreseeable future, Simons has been tasked with serving as Spurs' chief creator, but he's fallen by the wayside in this regard.
He's young enough and talented enough to kick on after this early blip, but there's little question that more is needed - and quickly.
Tottenham have further players who have struggled to impress this season, though, and there's another midfielder with a wealth more experience in the English game who may well be playing himself into a corner in Frank's system.
Frank must axe Spurs' "lucky boy"
Frank is far more pragmatic in his tactical set-up than his predecessor at the Tottenham Hotspur Stadium, but the general disgruntlement around the club at the moment emphasises the need for greater balance between the thirds.
The midfielders are the connective tissue, though, and while Joao Palhinha has been lauded as a shrewd summer signing, on loan from Bayern Munich, there's not enough impetus and dynamism in midfield, and Rodrigo Bentancur is becoming a problem in that regard.
Bentancur, 28, has racked up 128 appearances since joining Tottenham from Juventus in January 2022 (initially on loan), but injuries have kept him at an ebb and flow in north London, never quite reaching the full fluency that his talent and athleticism could lead him toward.
His consistent unavailability might have been stretched this season but for a fortuitous VAR call that kept him on the field after a studs-up challenge on Chelsea's Reece James at the weekend. Tottenham presenter Hollie Agombar called him "a lucky boy" after the game.
The £120k-per-week ace signed a new long-term contract only last month, which does stand as a marker of his standing under Frank's wing, but his connection with Palhinha in the middle of the park has not made him undroppable by any stretch, and there are bound to be concerns relating to the stodginess of Spurs' general play in the centre.
Of course, he's not without his uses. The South American ranks among the top 6% of Premier League midfielders this season for ball recoveries, the top 13% for clearances and the top 11% for blocks per 90, data via FBref, but this isn't enough to secure his long-term place in Frank's engine room, especially since he is not progressive enough on the ball and thus part of the wider creative problem.
A ball recovery is defined by the number of loose balls recovered by a player.
Whereas Simons has time on his side, Bentancur is a seasoned Tottenham star who is supposedly in the prime of his career. This was clearly the view of the powers that be down N17, having rebuffed summer interest from Atletico Madrid and indeed rewarded the midfielder with improved terms.
But he is not proving his worth at this moment in time, and Frank will expect that to improve swiftly, especially with the likes of Pape Matar Sarr and Bergvall gunning for more prominent roles.
Against Chelsea, Bentancur did himself few favours, even if he did manage to avoid a red card for that stamp on James. Writing of his performance in the derby, the Evening Standard criticised the hosts' midfield controller for being unable to provide protection from Chelsea counters, with his caution on the ball directly hindering Spurs' fight for quality in attack. He was hit with a lowly 4/10 match rating.
Much for Frank to chew on. However, it might be that Bentancur is beginning to demonstrate that he does not get into Tottenham's brightest 11, and that's a topic that will only intensify when the injured playmakers return. With that in mind, maybe he should be axed down the line.