Manchester City were left stunned after losing 4-1 to Sporting Lisbon in Ruben Amorim's final home game before he moves to Manchester United.

City started well and scored after just four minutes, Phil Foden continuing his run of only scoring in Champions League games this season. The visitors then toyed with Ruben Amorim's side for much of the half, but the team's recent inability to keep a clean sheet reared its head once more. Viktor Gyokeres had fluffed a one-on-one early on but made amends seven minutes before half-time, bouncing a shot past Ederson to make it 1-1 at half-time.

And City had plenty of reason to regret their profligacy in the opening moments of the second half as Max Araujo put Sporting ahead with a delightful effort, before a thunderous Gyokeres penalty after a Josko Gvardiol foul made it 3-1 before 50 minutes had been played.

A fairly generous handball decision gave Erling Haaland a chance to score from the spot with 20 minutes remaining but his attempt sailed high into the Lisbon sky after rattling the bar. Instead, the third penalty of the game -- Sporting's second -- saw Gyokeres complete his hat-trick and City concede four goals in a Champions League game for the first time since 2016.

Sam Lee analyses the game below.

Objectives can change pretty quickly in football. Most people would have presumed that City and Real Madrid would finished first and second in this new Champions League format and maybe they still will, but the safety net afforded to both of them is that the top eight and qualification for the final stages will suffice.

How many times have Madrid looked out of sorts when the Last 16 draw has been made, only to thrive by the time the match is played? City, as we know, often have these spells but usually find their top gear in the spring.

But the immediate focus for Guardiola's men has to be beating Brighton to get things back on track before the international break. In truth, dropping points again is probably not going to be fatal given how many games are left, and the potential for another strong finish, but they look vulnerable at the moment and simply need to put that right as quickly as possible.

Is there any consolation in saying that City were actually pretty good for the most part but completely undone by a few forays forward? Probably not, actually, because what seems to be the recurring theme in recent weeks is that City look somewhat like themselves just... weaker in every department.

Like an AI imitation, everything looks fine until you take a closer look. City should have been well clear after a largely impressive first half where they played good football, but they were too easily outdone by quick movement for the equaliser, and that is exactly how the two goals at the start of the second half came.

They even steadied themselves after that and looked solid enough, only to concede a second penalty. If they look weaker in every department it is because injuries have taken key players from every outfield area, and what is left, in midfield anyway, are players capable of knocking the ball around nicely but not so capable of winning duels and running back to stop counter-attacks.

That leaves the defence exposed too often and it means that matches like this can happen.

One thing about Haaland's recent form is that, usually, if he has not scored, it has hardly been his fault -- in many matches teams put three men on him, and City barely even try to find him to give him a chance.

It was only a couple of weeks ago when he wowed the world with a remarkable strike against Sparta Prague, before finishing off a beautiful City break, so there are more than a few signs of life there.

It just seemed on Tuesday as if he was caught up in the cycle that affected City as a whole -- if it could go wrong, it would do. City were playing some good stuff in the first half and threatening to blow Sporting away, and created some good chances for Haaland, but he almost seemed to rush them. He is their biggest goal threat by a mile and simply has to make them count.

By the time he took the second-half penalty, after City had been rocked by the two quick-fire goals, it just felt like one of *those* nights. And it was, for all concerned.