Arsenal were held to a 0-0 draw against Atalanta in their Champions League opener. The Gunners flew to Bergamo after a difficult yet successful win at the Tottenham Hotspur Stadium on Sunday, and Mikel Arteta wanted another victory. However, Gian Piero Gasperini’s side played really well, and both sides ended up denying each other with some very impressive defending. In the end, the two managers were content with the draw, and Gasperini admitted that he was blown away by what one Arsenal player did in Bergamo on Thursday night. Gian Piero Gasperini delivers verdict on David Raya after his pena…