Cristiano Ronaldo once again scored a late winner as Manchester United overturned a two-goal deficit against Atalanta to win 3-2 and move top of Champions League Group F at the halfway point.
Lionel Messi scored twice in the space of seven minutes as Paris Saint-Germain grabbed a 3-2 victory over RB Leipzig in a thrilling Champions League encounter.
Ole Gunnar Solskjaer was "sure" Manchester United would beat Atalanta after match-winner Cristiano Ronaldo completed a dramatic Champions League comeback on Thursday (AEDT).
Thomas Tuchel rallied Chelsea's bit-part players by telling them "the race is on" to prove themselves after Romelu Lukaku and Timo Werner were injured.
Diego Simeone justified his decision to not shake Jurgen Klopp's hand by highlighting the contrasting cultures after Atletico Madrid was downed 3-2 by Liverpool.
Luis Diaz's second-half finish propelled Porto to their first win in the Champions League this season as it beat Milan 1-0 to leave the Italians staring at an early exit.
Mohamed Salah made history by scoring in a ninth successive match for Liverpool to earn a dramatic 3-2 win over Atletico Madrid, which had Antoine Griezmann sent off and a late penalty overturned.