By Andy Dunn Mikel Arteta has told his players not to allow their season to implode after a “painful” Champions League exit in Munich. The Arsenal manager said he was “sad and disappointed” with the narrow defeat in the Allianz Arena and that the pain of losing to Joshua Kimmich’s second half header would go deep. But after the Premier League loss to Aston Villa last Sunday, Arsenal cannot afford to lose at Wolves on Saturday evening, otherwise they will almost certainly end their campaign without a trophy. And Arteta declared: “We have to show we are capable of turning it around. I will stand…