Bayern Munich 1-1 Celtic (3-2 on agg.)
Bayern Munich left it late to secure a 1-1 draw against Celtic and gained passage to the next round 3-2 on aggregate.
Changes by the Bavarians were instituted from the draw with Bayer Leverkusen, as Serge Gnabry, Leon Goretzka, Josip Stanisic, Raphael Guerreiro came into the staring line-up.
Bayern struggled to get going for much of the contest, and trailed around the midway stage of the second half through a curling strike from Nicolas-Gerrit Kuhn.
The Bavarians pushed tirelessly to get back in the overall clash and deep in stoppage got their reward when Alphonse Davies tucked in a loose ball from close-range.
Atalanta 1-3 Club Brugge (2-5 on agg.)
Atalanta's dreams of a last 16 berth came crashing down after Belgian champions Club Brugge bagged a 5-2 victory over two-legs in Bergamo.
Rising star Chemsdine Talbi stunned the masses on three minutes played when he displayed supreme composure to find the bottom-corner from inside the area.
The youngster grabbed a first half brace in the opening-quarter after latching onto a rebound from Marco Carnessechi to apply an easy finish.
Atalanta were close to get back in the contest with Cuadrado and Davide Zappacosta coming close through a succession of guilt-edge efforts.
However, the Belgians proved effective on the counter-attack and saw Ferran Jutgla pounced to make it three on the brink of halftime.
The Italian outfit got a lifeline a minute in the second half after Ademola Lookman connected with Zappacosta and fired in the top corner.
Lookman could've secured a brace from the spot moments later from a foul by Cuadrado according to a pitch-side review, but the Nigerian was denied by Simon Mignolet.
Atalanta finished the match with ten players in the remaining three minutes when Toloi was dismissed for pushing an opponent, leaving Brugge to victory.
SL Benfica 3-3 AS Monaco (4-3 on agg.)
Benfica overcame a relentless AS Monaco to advance 4-3 on aggregate after playing to a thrilling 3-3 draw in the second-leg on Tuesday.
The Portuguese giants hit the ground running inside the closing stages of the first half as Kerem Akturkoglu raced in at the back-post to find the back of the net.
Monaco bounced back in the matter of minutes when Takumi Minamino sneaked in to the near side of the box and drilled a layoff from Breel Embolo in off Anatoliy Trubin.
The Ligue 1 side were ahead for the first time in the match after Eliesse Ben Saghir pounced on a square pass to the box and finished with ease.
However, Benfica clawed level later on as Thilo Kehrer conceded a foul to give away a penalty which Vangelis Pavlidis tucked away comfortably.
Monaco refused to give up and were in the lead again as substitute George Ilenikhena ran in-behind the defence after Nicolas Otamendi's fluffed his lines and fired in.
The home team were in control once more a minute after conceding when Orkun Kokcu latched onto a cross-field ball to the box and finished off the far post.
Benfica got a penalty in added time after Krepin Diatta tripped Samuel Dahl in the box, but after going on review the referee rescinded the decision and saw out the clash.
AC Milan 1-1 Feyenoord (1-2 on agg.)
AC Milan crashed out of the UEFA Champions League 2-1 on aggregate against Dutch side Feyenoord in the Knockout play-off second-leg on Tuesday evening.
Milan were on course to overturn the first-leg deficit seconds in when Santiago Gimenez leaped on the end of a corner-kick to nod in from close-range.
Having the advantage at the break and start of the second half, the situation turned on the host who saw flying fullback Theo Hernandez dismissed for a second bookable offence.
It opened the way for the Eredivisie to come in their own and found substitute Julian Carranza connect with a pin-point cross to head in the equaliser.
Feyenoord did end the match with ten players too albeit at the end with Givairo Read dismissed for a second bookable offence, as the clash concluded.