Trevoh Chalobah just said the quiet part out loud about Chelsea

Chelsea continued their poor record against Arsenal on Sunday. The Blues fell to a 2-1 defeat and slipped to sixth in the Premier League table. 

Although an own goal from Piero Hincapie on the stroke of half time gave Chelsea hope, two goals from William Saliba and Jurrien Timber gifted Arsenal all three points. 

The Gunners' two goals came from set pieces. Saliba's opener was the 10th time Mikel Arteta's men had taken the lead in the league from a deadball situation. 

And although Chelsea aren't the only side to concede this way, a lot more could of been done to prevent their rivals taking advantage of the strongest part of their game. 

Trevoh Chalobah reveals Chelsea's set piece coaching hasn't been good enough

Even though Pedro Neto's sending off in the 70th minute didn't help matters, the damage had already been done. 

Trevoh Chalobah, who started alongside Mamadou Sarr in defence, has admitted to Chelsea's official website that despite the team putting in a lot of set piece work on the training ground, they were powerless to stop Arsenal's aerial presence. 

"We have to look at ourselves because we’ve been undone from two set-plays. We work a lot on set-pieces, both defensively and offensively, and we know how strong Arsenal are at them. These are the little details and we need to improve on them."

Confirming that Liam Rosenior has assigned the players individual and collective roles, Chalobah added that the onus is on the players to start cutting out the mistakes. 

"We have to know our roles both collectively and individually, and we all need to step up. We’ve conceded too many goals from set-pieces, that’s why we are where we are in the table."

Chelsea have now conceded 10 set-piece goals from 13 matches since Rosenior took over from Enzo Maresca.

No more room for error as Champions League hopes hang by a thread

If the Blues are to qualify for next season's Champions League, they really must improve defensively.

With fellow top four hopefuls Aston Villa and Manchester United still to play, as well as Manchester City and Liverpool, Chelsea cannot afford to keep making the same mistakes.

While his attackers may continue to hit the back of the net, Rosenior must ensure his forever-changing back line becomes more resolute.

There are just 10 games left to play, and Chelsea are six points off fourth. 

Next up is a mammoth away tie to Aston Villa on Wednesday, with the loser almost certain to miss out on major European football next season, so the pressure really is on.