One of the weirdest goals you will ever see in Champions League match full of calamity

Barcelona star Raphinha scored one of the most bizarre goals you will ever see in a Champions League match packed with calamity.

In the 64th minute, Benfica goalkeeper Anatoliy Trubin tried to clear the ball from what should have been a regulation goal kick.

Instead, Trubin fired the ball into Raphinha's forehead and it loopily rebounded over the stunned goalkeeper and into the back of the net.

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In a truly extraordinary game, Raphinha later scored a 96th minute goal to give Barcelona a 5-4 win in Lisbon on Wednesday (AEDT).

"We came with the mindset that we could turn the game. We never gave up and managed to grab a win," Raphinha said.

Arthur Cabral was sent off for Benfica in the 98th minute while Trubin's masterpiece was not the only goalkeeping blooper.

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Benfica's Vangelis Pavlidis swooped on a Wojciech Szczesny howler on the way to scoring the third fastest hat trick to start a Champions League game.

"I'm not quite sure what we've seen. An extraordinary game of football... mind blowing," host Adam Peacock said on Stan Sport.

Greece star Pavlidis scored two minutes into the match and then in the 22nd and 30th minutes as Benfica led Barcelona 3-1 at halftime.

According to stats provider OptaJoe, the fastest hat tricks had been scored in 23 minutes by Robert Lewandowski for Barcelona in 2022 and by Marco Simone in 24 minutes in 1996.

"I'm just trying to pick my jaw off the floor," Semra Hunter said on Stan Sport from Spain.

"Some of those goals were absolutely hysterical."

Elsewhere, Liverpool became the first team to guarantee a place in the last 16 of the new Champions League format by beating Lille 2-1.

Harvey Elliott's bouncing, deflected shot gave Liverpool its seventh win from seven games, just after 10 man Lille had equalised following Mohamed Salah's opening goal.

Liverpool needed a point at Anfield to be sure of reaching the round of 16 as one of the top eight teams in the league stage, skipping the playoff round for teams ranked ninth to 24th.

Salah raced through in the 34th minute to sweep Liverpool ahead with his 22nd goal in all competitions this season.

And when Lille's Aissa Mandi was sent off just before the hour mark, Liverpool looked certain to extend its 100 per cent record in the league phase.

But Anfield was stunned when Canada striker Jonathan David converted from close range to level the score in the 62nd minute.

It didn't take long for Liverpool to regain the lead through Elliott's deflected effort five minutes later.

"All my life I've dreamt of playing Champions League football, not only for my boyhood club but to play here at Anfield in front of our fans and especially to score, it's kind of a pinch me moment," Elliott said.

At Stade Louis II, with Prince William watching on, Aston Villa's hopes of automatic qualification for the round of 16 took a blow after a 1-0 loss to Monaco.

Villa led the standings early in the league phase of the competition after winning their first three games.

But defeat to Monaco left the Premier League club eighth.

Wilfried Singo's goal from a corner in the eighth minute was enough to secure the win for ninth placed Monaco.

- with AP