Five things we learned from the weekend fixtures, including Chelsea’s Diego Costa and Arsenal’s central midfield frustrations

Arsenal need a defensive midfielder

This is an issue that Arsene Wenger certainly seems to be aware of, but Arsenal’s need for a defensively minded central player was highlighted by the ease with which Everton cut through them at times at Goodison Park – with Steven Naismith’s goal for the Toffees being a particular example, Everton having carved through oceans of space in the Gunners’ central area.