Ajax Amsterdam 0-1 Chelsea
Chelsea claimed a second straight victory in Group H after securing victory away to Ajax Amsterdam on Wednesday evening.
The Dutch thought they had taken the lead through Quincy Promes midway through the first half, but the Dutchman's strike was overturned by the Video Assistant Referee.
However, it was a substitute who secured the spoils for the Blues, with Mich Batshuayi firing in off the crossbar after being set up by fellow substitute Christian Pulisic.
As a result, Chelsea are the first team to defeat Ajax in all competitions this season.
RB Leipzig 2-1 Zenit St Petersburg
RB Leipzig rallied from behind to secure a 2-1 victory over Zenit Petersburg at the Red Bull Arena on Wednesday evening.
Yaroslav Rakitskiy gifted the Russian outfit the lead on 25 minutes with his second-ever Champions League goal.
Konrad Laimer restored parity for the Bundesliga outfit four minutes of the after the halftime break, before Marcel Sabitzer got the game's winning goal 10 minutes later.