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Raphinha scored twice as Barcelona booked its place in the competition's Round of 16 by fighting back from 3-1 and 4-2 down to win an incredible game in Lisbon.

Raphinha's winning goal – a low strike on the counter attack moments after Benfica had a penalty appeal knocked back – was timed at 95 minutes and eight seconds.

Speaking after his dramatic intervention, the Brazilian said: "I think I'm in the best moment of my career.

"We knew it would be a pretty tough game. I know the difficulty of playing here, in front of their fans. They know how to play very well and have players of the highest level.

"We didn't fall apart at 3-1 in the first half. We came back focused to change the game. It was a spectacular match for everyone. Benfica could very well have won, but we took it."

The game was the first in UEFA Champions League history to finish 5-4, with Barca becoming just the second team to win a match in the competition despite conceding four goals after Borussia Dortmund won 8-4 Legia Warsaw in November 2016.

It was also the first time Barca had come from two goals down to win a European Cup or UEFA Champions League game, and just the second match in the competition to see Benfica lose after going two goals up after a 3-2 loss to Red Star Belgrade in September 1984.

Head coach Hansi Flick said of his side's incredible fightback: "The most positive thing was the mentality we had, we came back and it's wonderful, this is football.

"I have never experienced a comeback like this. Benfica are very good, they made us defend deep."

Both sets of players became involved in a fracas at full-time, and Raphinha alleged a number of Benfica players, infuriated by the failure to penalise Fermin Lopez in the build-up to the winner, hurled insults at him.

"I am a person who respects everyone. When I left the field there were people who insulted me. I returned the insults, I know I shouldn't," the winger said.

"We all got heated, but the Benfica players preferred to insult me. I'm a person who doesn't take anything home.

"I respect if they respect me, but I don't shut up if they insult me. It's normal after a game that ends like this."

Flick lauded Barcelona's mentality after the match.

"It was a very crazy game. The most positive thing was the mentality we had. We came back and that's wonderful. That's football and that's why we love it," Flick said. 

"I don't think I've ever experienced a comeback like this. It is unbelievable. We didn't play so well in the first half. They are very good and scored first.

"They made us defend very deep. We were not in the right position. In the second half we were better and substitutions helped us a lot."

Despite the adulation of the victory, Flick urged his players to turn their attention to their next LaLiga clash, which comes against Valencia at the Camp Nou on Monday (AEDT).

Barcelona drew 1-1 with Getafe in its most recent league fixture, leaving it third on the standings and seven points behind rival Real Madrid, which is now top.

"The victories give us time to keep believing in this project and send the message to the young players that we can and want to improve," he said.

"It's very important to focus on the Valencia game and we also want to beat Atalanta. We don't have to think that we are at ease."