Arsene Wenger's last European home game was headed to victory, only for Antoine Griezmann to score crucial equaliser, changing the entire perspective of the tie.
The top two in La Liga meet on Sunday as Barcelona host Atletico Madrid at Camp Nou, with the stakes in the title race higher than ever before.
Barcelona's dressing room has reportedly given its backing for the club to pursue a summer move for Antoine Griezmann, also a target for Manchester United.
Atletico Madrid will look to consolidate second spot in the La Liga table when they travel to the Ipurua to take on Eibar on Saturday.
Antoine Griezmann is reportedly set to demand a £400,000-a-week pay package to snub Barcelona and join Manchester United in the summer.
Chelsea host Spanish giants Atletico Madrid in the final round of fixtures of the group stage, knowing that a win would seal top spot for the hosts
Manchester City have reportedly joined Barcelona and neighbours Manchester United in the race to sign Antoine Griezmann next summer.
Barcelona are reportedly tracking Antoine Griezmann, and are prepared to shell out €100 million to sign him next summer
Barcelona will look to continue their perfect start to the season when they travel to the Wanda Metropolitano to face Atletico Madrid on Saturday.
Atletico Madrid's brand new Wanda Metropolitano stadium will host its very first La Liga match against Andalusian side Malaga on Saturday.