Welcome to The Radar, a Sky Sports column in which Nick Wright uses a blend of data and opinion to shed light on need-to-know Premier League stories. This week:

🔺 Arsenal's defence still getting stronger?
🔺 Rogers making instant Chelsea impact
🔺 Hull's unsung hero in defence
🔺A player to watch this weekend

Arsenal's ever-improving defence

Sunday's game at the Emirates Stadium pits the Premier League's best defence this season against its best attack. While Arsenal are yet to concede a goal, picking up where they left off in May, Chelsea have top-scored with seven in two games.

Arsenal are not the only side to have kept back-to-back clean sheets. Hull have defied expectations to do the same. But while Hull have needed their goalkeeper Konstantinos Tzolakis to be at his best, Arsenal's David Raya has mostly been a bystander.

A Jack Rudoni header remains his only shot on target faced. Raya played a huge part in last season's success, of course. But Arsenal retain an extraordinary capacity to supress chances.

Since the start of last term in the Premier League, they have allowed under 0.50 expected goals in 20 out of 40 games, a figure which includes their first two games of the new campaign.

No other side even gets close to their total, with Liverpool next on the list on eight. Last season's runners-up Manchester City have only managed it twice. Chelsea are only just ahead of them on four.

Arsenal fans are justifiably lamenting the club's failure to strengthen their attack in the transfer window. But the numbers highlight the gulf between them and the rest out of possession.

It speaks to the standards they have set as a collective, too, that the absence of their best defender, William Saliba, not to mention another starter in Jurrien Timber, has barely even registered during the opening weeks of the new season.

The club have of course invested heavily to provide cover. But Ezri Konsa's playing time so far amounts to only 11 minutes, with Cristhian Mosquera deputising ably alongside Gabriel at centre-back, and Ben White stepping in at right-back.

There is added depth and steel in midfield, too, thanks to the signing of Bruno Guimaraes. But, like Konsa, he has been eased in.

The key to Arsenal's defensive excellence lies instead in the strength of the tactical foundations put in place by Mikel Arteta. Consider the fact that, before the opening two games of this season, the back four of White, Mosquera, Gabriel and Riccardo Calafiori had never previously started a Premier League fixture together.

Arsenal's solidity provides cause for optimism for the fight that lies ahead to retain their Premier League crown, even as they face their toughest test yet against free-scoring Chelsea.

Instant impact from Rogers

The visit of Xabi Alonso's side will give Arsenal a glimpse of what have been at the other end of the pitch. Before their fruitless attempts to land Vinicius Junior and Julian Alvarez, there was the unsuccessful pursuit of Morgan Rogers, who opted for Chelsea.

Watching him in their 4-3 win over Brighton on Sunday from the press box at Stamford Bridge, a few rows behind the dugouts, almost at ground level, was a first-hand reminder of the devastating power and incisiveness that made him so coveted.

Operating from the left, in precisely the position in which Arsenal have seemingly left themselves light, he drove past two Brighton defenders to set up Chelsea's second goal, then produced the turn and through-ball to launch the break for their third.

Those moments highlighted his technical and physical prowess and there were plenty of others to catch the eye, as there were in Chelsea's opening game against Fulham. Many felt Chelsea had overpaid at £117m. He looks determined to prove otherwise.

Rogers already has a goal and an assist, while only Manchester United's Bruno Fernandes has a higher combined total of shots and chances created across the opening two games.

It is no surprise to see Cole Palmer and Joao Pedro, the other two members of Chelsea's front three, next on the list. Their challenge now is to produce the same level of threat against a stronger foe. Rogers, Arsenal's one that got away, may feel added motivation.

Egan showing his worth

Back to Hull's defensive record and while Tzolakis has undoubtedly been key, keeping out shots with an xG of 1.92, giving him the best underlying data of any goalkeeper in the Premier League's opening two games, it would be remiss not to mention John Egan.

The 33-year-old centre-back, formerly of Sheffield United, might have felt his Premier League days were over before Hull's unlikely promotion but he was one of six Hull players to sign a new and improved contract this week and he is certainly doing his bit.

Egan made a remarkable 17 clearances in their win over Manchester United on the opening weekend and followed it up with another 10 against Coventry, putting him on an average of 13 per game and giving him by far the highest total in the division.

It might not be pretty but it is certainly effective. Hull will hope for more of the same when they face Aston Villa on Sunday.

Player Radar: Who else to keep an eye on

Best of luck to Everton's one-man strike force Thierno Barry against Manchester United. The club's sale of Beto and failed moves for Richardson and Folarin Balogun in a nightmarish transfer window have left him as their only option up front. No pressure, son.

Live Radar: What's on Sky this weekend?

Four Premier League games will be shown live on Sky Sports this weekend, starting with Ipswich vs Liverpool on Friday night.

Saturday's action sees Hull host Aston Villa in the evening kick-off, before a Sunday double-header. Everton take on Manchester United at 2pm, followed by Arsenal face Chelsea at 4.30pm.

Read last week's Radar column

Manchester United's issues defending corners and the growing (or should that be lengthening?) threat of Ethan Ampadu's long throw went under the microscope in the last column.