Everything you need to know ahead of Wednesday's UEFA Champions League semifinal at the Parc des Princes as Arsenal look to mount a comeback against PSG.

A UEFA Champions League final spot is up for grabs as France’s PSG host Arsenal in second leg of the semifinal in Paris.

Felix Zwayer has been appointed as the referee for Arsenal 's Champions League semi-final second-leg decider against Paris Saint-Germain on Wednesday night. UEFA have announced that the German official, 43, will take charge of the return leg in Paris, with Arsenal a goal down on aggregate following last week’s narrow defeat at the Emirates Stadium.