By James Cormack Arsenal host a midweek London derby on Tuesday night when they welcome mid-table Chelsea to the Emirates Stadium. The Gunners secured an imperative three points at Wolves on Saturday which returned them to the top of the Premier League table. Victory on Tuesday would see them open up a four-point gap over Manchester City, who’ll have two games in hand before they travel to Brighton on Thursday. Arsenal were far from spectacular last time out but, after a tough eight days which included their exit from Europe, a win at Molineux was all that mattered to keep them firmly in the t…