Producer La Masia has played sparingly this season but managed the decisive strike against Real Sociedad on Wednesday.
Puig helped his side advance to the Spanish Super Cup final after a 1-1 draw in 120 minutes. The 21-year-old scored on the spot to land a 3-2 victory on penalties for his team.
While many fans have called on the talented youngster to be given more minutes, Puig has been used sparingly this season by Barca head coach Ronald Koeman.
Puig came off the bench against Sociedad on Wednesday for his seventh appearance of the season, all of whom have come in as replacements.
Although his consistent minute chances still look slim, Puig said after the game that he will continue to fight for his place at Camp Nou.
“I am very happy to have scored the last penalty,” said Puig. “I volunteered to take it. I shot with great conviction – you have to believe in yourself. I have never lost the desire to be part of the first team and I will continue to fight for it .
“Ronald named four players to take the penalties. I asked for the fifth. I’m a very happy guy, I’ve never lost my smile. I’m lucky, I will never give up.”
Koeman confirmed that Puig volunteered to take the decisive kick.
He said, “The final penalty? I had four names written down, and I asked who wanted to shoot the last one to win. Riqui wanted to take it, with determination.”
Koeman also praised two other 21-year-olds who broke with Barca this season, Ronald Araujo and Oscar Mingueza.
“Araujo has improved a lot in a short period of time, especially in his composure and personality,” Koeman said. “He’s also improved on the ball. He’s on a very good track, but he has to keep working. He’s the future of the club, like Mingueza. Be humble and keep your feet on the ground.”