Two of Europe’s greatest sides to have never won a UEFA Champions League trophy clash in league phase match at Emirates.Who: Arsenal vs Athletico MadridWhat: UEFA Champions LeagueWhere: Emirates Stadium in London, United KingdomWhen: Tuesday, October 21 at 8pm (19:00 GMT)How to follow: We’ll have all the build-up on Al Jazeera Sport from 5pm (16:00 GMT) before our live text commentary stream.English Premier League (EPL) leaders Arsenal host Spanish powerhouse Atletico Madrid at the Emirates Stadium with both sides looking to consolidate their UEFA Champions League (UCL) ladder position in the Matchday 3 showdown.Recommended Stories list of 3 itemsend of listThe Gunners head into the blockbuster European matchup riding high in the Premier League after winning four of their last five matches and sitting three points clear of Manchester City on top of the standings.For the Rojiblancos, a three-time Champions League finalist, Tuesday’s fixture is a prime opportunity to test their mettle against last season’s UCL semifinalists.Here is all to know before their epic clash:How did Arsenal and Atletico fare in their domestic leagues this past weekend?The Gunners beat Fulham 1-0 away in a narrow Premier League victory at Craven Cottage, while Atletico returned from the international break to defeat Osasuna 1-0 in a tight contest in La Liga.What’s the closest both sides have come to winning the Champions League?Arsenal came closest to winning the UCL in 2006, reaching the final and taking a 1-0 lead against Barcelona before ultimately losing 2-1.Atletico have reached the final three times in 1974, 2014 and 2016. Their most recent loss might have been the most painful: An excruciating extra-time defeat, 5-3 on penalties, to ar …