Lukaku transforms Chelsea but Arteta fiddles while Arsenal burn

Time and time again Kieran Tierney found himself exposed on the left of the Arsenal defence

Chelsea's Romelu Lukaku reacts after the final whistle during the Premier League match at the Emirates Stadium, London. Picture: Nick Potts/PA Wire. 

Mikel Arteta will have learned so much about his Arsenal squad from this defeat, if it is not too late for the Spaniard to save his job of course.

But if the pre-season favourite with the bookmakers to be the first manager to get the boot does end up receiving a P45 he will have only himself to blame; a Premier League boss needs to act on what his eyes are telling him. In this game Arteta did not react until it was far too late.