Coutinho, a January arrival from Liverpool, also supplied an assist for Suarez before getting on the score-sheet, and the Brazilian is already reveling in a productive relationship with his superstar team-mates.
"Just when a player seems to have done everything, he goes and surprises you".
Girona got things started in the matchup by capitalizing off of a poor defensive play from the home team.
Coutinho is developing an understanding with the front two and was involved in a lovely move where Messi sent him through before he squared the ball to Luis Suarez, who eventually went onto score a hattrick.
"We were waiting to see how he was going to beat the wall and then he goes underneath it". He chose to go with the grounded free kick under the wall and in. You see it and you think it's easy.
Barca managed to bag a sixth goal in the 76th minute as Dembele picked out Suarez with a low cross and the Uruguayan made no mistake to complete his hat-trick.
He told Movistar; "Leo is unbelievable".
"It's incredible how good he is".
Fortunately for Barcelona, Luis Suarez equalized within minutes and the game was level again.
The victory also allowed Barcelona to break the club milestone for longest unbeaten run in La Liga that had stood at 31 games since the 2010-11 season, under former coach Pep Guardiola. We want to do the best we can,"he said".
It was the first time Barcelona has started with Messi, Suarez, Coutinho and Ousmane Dembele on the pitch as they demonstrated just how devastating they can be in attack.
"Dembele offers more width, he's a winger and he's still very young".
"When a player gets a goal, like Coutinho, it's a boost for their confidence, which players always need".
Barca finished the game with 10 when, after making all three substitutions, right-back Nelson Semedo limped off with an apparent hamstring injury.