The Chelsea head coach was speaking after this afternoon's Premier League clash against Arsenal, which ended in a frustrating 2-1 defeat.

For large spells of the game, the Blues were the more proactive side and created the better chances. But two goals from corners, scored by William Saliba and Jurrien Timber, sealed victory for the hosts. We also ended the game with ten men after Pedro Neto was shown quick-fire yellow cards.

And while Rosenior saw several positives from his side's performance at the Emirates, he emphasised that our own mistakes are impacting our ability to come away from matches with all three points.

‘I think it’s clear where our strengths are and what we need to improve on,’ explained Rosenior. ‘We conceded two goals from set-plays, which has ultimately cost us the game, and it’s really disappointing to have another red card.

'These are things we’ve spoken about, because there is a lot of good [in our play], but I don’t want to be sat her talking about how well we’ve played every week without picking up points.

‘It’s [the red card] is disappointing for Pedro because he’s a very, very good player and you want him on the pitch. Until that moment, he was actually causing Arsenal problems. The frustrating thing for us is that it’s not just today, but we’re going to miss him against Aston Villa.

'It’s not just Pedro, though. As a group, and me as the leader, we have to take more accountability for some of the decision-making in terms of our discipline. And the goals that we’re conceding, not just today, some of them are not acceptable at this level.’

Arsenal's prowess at set-pieces is well documented – the Gunners have 16 goals from them this term, the joint-most from any side in a Premier League season – but Rosenior believes the Blues should have better dealt with the two corners from which we conceded.

He also accepts that we can't afford to keep losing players due to red cards, with seven Chelsea players dismissed in the Premier League this term.

'It’s a focus and concentration thing that we need to get right,' he said. 'We had ten games from when I came in where we didn’t have these issues, but now we’ve had two [red cards in two games, so there is something deep lying that we need to get to the bottom of.

'The thing is for me, if we can get to the bottom of those two main things, we can be a very, very good team and achieve all the things we want to achieve.’