The strike also comes just over a week after the 21-year-old's decisive penalty in the shootout against Real Sociedad in the Supercopa de Espana semi-finals.
Now, there are just signs that the midfielder is edging his way into Ronald Koeman's plans at the Camp Nou. He's clearly a popular member of the dressing room.
"It's surreal to score with my head," Puig said at the Estadio Martinez Valero.
"I don't think I have done since I was in the Cadete A [under-16s] team. I don't score many anyway. And now I've done it with my head!
"I'm having quite a difficult season because I'm not used to playing so little. But I'm getting stronger mentally.
"I'm happy with the team's hard work and how my teammates are helping me."
After warning him about playing time in the summer, Koeman has played Puig 10 times in all competitions this season.
"When the coach gives you minutes, you have to show that you have a future [at the club]. He was important in this game."