Arsenal will take a 3-1 lead into the second leg against Valencia after coming from behind while Chelsea scored the potentially crucial away goal in Germany to extend his team's unbeaten run.
The draw was a major blow for Manchester United's hopes of Champions League qualification.
Chelsea climbed into the final Champions League qualifying spot, one point above fifth-placed Arsenal and three ahead of Manchester United, but has played one game more.
Chelsea beat Slavia Prague 4-3 on aggregate over the two legs while Arsenal got the better of Napoli 3-0 to make the Europa League last four for the second straight year.
A video showed a group of fans singing "Salah is a bomber" apparently in reference to the Egypt international.
In other Europa League games, Benfica beat Eintracht Frankfurt 4-2 after Joao Felix's hat trick while Valencia secured a 3-1 away win at Villarreal.
Eden Hazard produced a fine individual display to complete a 2-0 victory over West Ham that lifted Chelsea to third in the Premier League.
Man City fielded virtually a second-choice team amid a run of games every three days, and still had far too much for Cardiff in a match that resembled a practice session of attack vs defence at times.
Toby Alderweireld's 90th-minute own-goal helped Liverpool beat Tottenham 2-1 while Chelsea got a little help from the officials as they sealed a comeback 2-1 win over Cardiff.
Warnock was furious on the touchline and further enraged that Antonio Rudiger escaped a red card for dragging down Kenneth Zohore moments later with the striker breaking through on goal.
Chelsea didn't specify which player was the target of the racist abuse. Britain's Press Association reported that monkey chants were heard from a small group of Dynamo Kiev fans in the corner of the end Chelsea was attacking.
Everton scored two second-half goals to beat Chelsea 2-0 at Goodison Park on Sunday in the Premier League.
With Napoli in a comfortable second place in Serie A, Ancelotti looks sure to lead the team back into the Champions League next season.
Chelsea could now ask the Court of Arbitration for Sport to grant an interim ruling, which would allow players to be signed in the offseason.
Arsenal took the lead through Iwobi after just four minutes but the game turned when Sokratis was sent off, resulting in Rennes going all out and netting in three goals.
Gonzalo Higuain and Jorginho gave new Fulham boss Scott Parker's former side Chelsea a 2-1 win in the Premier League on Sunday.
Former Chelsea captain John Terry and manager Jose Mourinho however, felt that Kepa Arrizabalaga's actions lacked a bit of respect.
Manchester City beat Chelsea 4-3 on penalties to defend their League Cup title after a goalless 120 minutes at the Wembley.
The Manchester United-Liverpool rivalry is the most bitter in all England and United fans know they have the chance to hand a serious blow to Liverpool's ambitions of lifting the Premier League title for the first time in 30 years.
Valencia went through 3-0 on aggregate after beating Celtic 1-0 at home.
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