Arsenal vs Chelsea: Defensive Doubts Ahead of Derby

Arsenal step into Sunday’s derby with Chelsea with a familiar mix of momentum and anxiety. Third in the Premier League table and boasting the best defensive record in the division, Mikel Arteta’s side have yet to concede a goal this season. Now comes the real examination: a Chelsea visit to the Emirates Stadium and a chance to close the gap on the teams above them.

Injuries cloud Arsenal’s rock‑solid start

Two games, two clean sheets, and yet Arteta walks into the weekend juggling problems at the back. The win at Villa Park came at a cost, with both Bruno Guimaraes and Cristhian Mosquera forced off.

Arteta was deliberately guarded when pressed on Guimaraes’ condition.

"[Bruno] had a knock against Villa in the previous game and he's being assessed. Hopefully tomorrow he will be okay for training."

On Mosquera, the tone was slightly calmer but no more definitive.

"It was more precaution than anything else, so we'll have to see in the session tomorrow how he feels."

Those are hardly the words of a manager fully at ease heading into a derby where one mistake can flip the narrative of a season.

William Saliba is already out with a back injury, and the timeline around his return remains hazy. Arteta admitted there is still no clear answer.

"We don't really know the amount of weeks he's going to be out because it's about a healing process… the progression has been really positive in the last few weeks, but we need to wait and see."

So Arsenal’s most reliable defender stays on the sidelines for one of the campaign’s early marquee fixtures.

The good news? Jurrien Timber is finally back in full training and, in Arteta’s words, "in a really good place." Whether that translates into minutes against Chelsea will be decided after Saturday’s session. For now, he is a live option rather than a long-term hope.

Declan Rice, who also had to come off against Villa, has trained all week and is expected to be available. That single sentence will ease a lot of nerves around north London. Without Rice, Arsenal’s structure bends. With him, it holds.

Konsa on standby, attack left light

If Mosquera fails to make it, Ezri Konsa is ready for a full debut in central defence. Arteta has already made it clear the defender is part of his plans for this one, confirming Konsa is "certainly available in the squad."

It would be a big stage for a first start, but Arsenal have little room to be cautious. Chelsea’s front line will test any uncertainty, and the Emirates crowd will quickly sense if the back four looks patched together rather than polished.

Further forward, the picture is no less intriguing. Arsenal’s attacking options are thin after a brutal deadline day. Gabriel Jesus, Ethan Nwaneri and record sale Gabriel Martinelli all departed late in the window, and none were directly replaced. The squad now leans heavily on what remains.

Bukayo Saka and Martin Odegaard carry even more responsibility between the lines. Kai Havertz, facing his former club, stands as the focal point in a system that demands constant movement and sharp decision-making. There is less margin for an off-day when the bench no longer brims with like-for-like alternatives.

Greek winger Christos Tzolis offers something different on the left, while Myles Lewis-Skelly brings energy and ambition in midfield alongside Rice. They are part of a younger, leaner supporting cast, asked to deliver in a fixture that rarely forgives inexperience.

How Arsenal could line up

Arteta is expected to stick with his preferred 4-2-3-1 shape, built on control in midfield and width from the full-backs. On current information, Arsenal’s likely XI looks like this:

Arsenal possible starting XI (4-2-3-1): Raya; White, Konsa, Gabriel, Calafiori; Lewis-Skelly, Rice; Saka, Odegaard, Tzolis; Havertz

The structure is familiar. The faces around the edges are not.

Kick-off, TV details and the stage ahead

The Premier League clash kicks off at 16:30 on Sunday, 6 September 2026, at the Emirates Stadium. In the UK, the game will be shown live on Sky Sports Main Event.

Arsenal arrive with the league’s tightest defence, a trimmed attack, and a derby that could tilt their season. Do they have enough depth, and enough nerve, to turn a solid start into something far more serious?