Chelsea made it four wins from four matches in Group L by edging out a spirited BATE Borisov 1-0 in Belarus.
With 3 consecutive wins, Chelsea are poised to reach the last 32 of Europa League, with Arsenal set to join them following their 1-0 win.
Arsenal take on Sporting CP while Chelsea take on Bate Borisov in their Europa League encounters.
Ivan Rakitic came off the bench to inspire FC Barcelona to a 2-0 win over BATE.
Bayern Munich humbled AS Roma in their backyard, claiming a stunning 7-1 victory while Jose Mourinho's Chelesa F.C. netted six times in their thumping win over Maribor. Ukranian club Shakhtar also contributed to the goal spree, winning 7-0 against BATE Borisov.
BATE Borisov, who stunned Bayern Munich last time out, were brought back to earth with a thud here Tuesday as Roberto Soldado's hat-trick earned Valencia a 3-0 win.
Belarus champions BATE Borisov have made a strong start to their Champions League campaign, topping Group F with a maximum of six points, but their success has come as no surprise to club president Anatoly Kapsky.
A fledging Barcelona side showed what the reigning Champions League winners have in reserve as they swept aside BATE Borisov 4-0 in a relaxed atmosphere at the Camp Nou.
Italian champions AC Milan closed on the Champions League knockout phase after an entertaining 1-1 draw at Belarusian side BATE Borisov in Minsk on Tuesday.
AC Milan coach Massimiliano Allegri has targeted a victory on Wednesday against group minnows BATE Borisov in order to keep pace with reigning champions Barcelona.
Lionel Messi scored once in each half as Barcelona routed BATE Borisov 5-0 in the Champions League on Wednesday for the defending champions' first victory in Group H.
With two hat-tricks in his last three games, Lionel Messi looks primed to lead defending champion Barcelona to their first win of this Champions League campaign at BATE Borisov in Group H on Wednesday, while injury-plagued AC Milan hosts Viktoria Plzen.