This follows their dramatic 2-1 win over Bayern Munich on Wednesday night. The game was delicately poised at 2-2 after the first leg at the Allianz Arena.
Souness hailed Pep Guardiola, City manager, for having assembled and parading an ‘incredible’ array of players. City were defeated 2-1 by Leeds United at the Etihad on Saturday but still maintain 14 points lead on the Premier League table.
Juventus defeated Lokomotiv Moscow 2-1 in Russia, thanks to goals from Aaron Ramsey and Douglas Costa. Paris Saint-Germain also advanced to the knock out stage with two games to spare after beating Club Brugge 1-0 at home.
Ajax also qualified despite losing 2-1 in Amsterdam, following their impressive 4-1 victory at Real Madrid. Tottenham Hotspur claimed a 4-0 aggregate win over Borussia Dortmund and FC Porto needed extra time to see off Roma.
They are: Manchester United, Celtic, Basel, Espanyol and Sevilla. Celtic progressed into the next round, following an incredible2-1 away victory over Lazio in Italy on Thursday.
"We are out, I had the feeling we were incredible already, but we made mistakes in the boxes in the key moments," Guardiola told BT Sport. Guardiola also rued Sterling's incredible open-goal miss, which would have made it 2-2.
Ajax also qualified despite losing 2-1 in Amsterdam, following their impressive 4-1 victory at Real Madrid. Tottenham Hotspur claimed a 4-0 aggregate win over Borussia Dortmund and FC Porto needed extra time to see off Roma.
They are an incredible team. I know the manager really well. Let's enjoy tonight and think about that one soon. "We have experience against them but they are a different team now. They're on a incredible run.
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He expressed concerns that Manchester City's "incredible" improvement this season could leave other clubs in the Premier League behind. The Blues sit 11 points behind leaders City following their 2-1 win over Huddersfield.
Mourinho added: "Another goal and another incredible effort and performance from Alli from first minute to last. "His work rate was absolutely incredible so for me these little big details are more important than what people initially see.
Manchester City have retained the Premier League title, despite an incredible fight from Liverpool. City came from behind to win 4-1 at Brighton, while Jurgen Klopp's men took second spot following a 2-0 win against Wolves.