Aleix Vidal sealed his move to Barcelona from Sevilla on Monday, signing a five-year contract after undergoing a medical.
Barca revealed on Sunday that an agreement had been reached to bring the versatile right-sided player to Camp Nou on a deal until 2020.
The 25-year-old spent just one season with Sevilla after moving from Almeria, but made a big impact as Unai Emery's side won the UEFA Europa League for a second successive season.
Vidal's impressive displays earned him a first call-up to the Spain squad, for their upcoming friendly with Costa Rica and Euro 2016 qualifier against Belarus.
"After the birth of my daughter, this is the most important day of my life. I am back at what used to be my home," Vidal, who played for Barca for one season alongside Jordi Alba in the Under-14 B team, told the media.
"If it's the start of a winning cycle, then so much the better."
"From the conversation I had with Luis Enrique I presume he'll be the manager for next season," he said.
"I've played for a lot of teams before arriving at Barca, but I hope this one's the last," he said.
"I went through a lot to get here and I'm living a dream. I always try to give my best.
"There's no better way to learn than by playing with these team-mates.
"I'm coming here to find my niche. These four months will be good for me to improve in certain areas."
