Unai Emery insists Arsenal must improve their defensive displays after shipping late goals to Europa League minnows Vorskla Poltava.The Gunners raced into a four-goal lead as a Pierre-Emerick Aubameyang double, a Danny Welbeck header and a tap-in from substitute Mesut Ozil set them up for a big win.But Vorskla rallied and halved the arrears as Volodymyr Chesnakov pulled one back before Vyacheslav Sharpar scored with the final kick of the evening as the opening Group E clash ended 4-2.Head coach Emery made eight changes from the weekend win at Newcastle as goalkeeper Bernd Leno was handed his debut.But, in conceding to the Ukrainian Premier League outfit, Emery has yet to see his Arsenal side keep a clean sheet and he knows it is an area where the team need to sharpen up.“It’s our disappointment today,” he said of the two goals.“Little by little, we are conceding a few chances to the opposition, the same like in Newcastle.“But we need to continue to improve on this because in the last minute in Newcastle and again today in the last 20 minutes, we conceded two goals.“Our challenge is to be competitive for 90 minutes of each match and this is one thing to improve.”Despite the late two goals being conceded, it was a very comfortable evening for Emery's men, despite getting off to a slow start in a poor first-half.However, the result isn't the only thing being discussed in the aftermath of the match.A video has emerged on Twitter and is quickly doing the rounds of a Vorskla player spitting in his hands and wiping it over his own face.It's safe to say his disgusting actions haven't been received well by football fans, and it's something he probably wishes wasn't caught on camera.

Each to their own, we guess.