The Spanish winger noted that it was his wish to prove himself at Camp Nou made him return to the club, while thanking Pep Guardiola for trusting in him
The 20-year-old had a dream debut as a Barca starter on Saturday as he scored the club's first goal and turned in a great display in the 2-1 victory against Real Sociedad.
Tello admitted that his desire to prove himself at Camp Nou made him leave Espanyol B and return to Barca, where he had previously spent six years as a youth player.
"Espanyol offered me a place on their first team, but I had a wish, which was to triumph here," Tello told Barca TV.
"When you leave there is always a thorn in your side, and when I was offered the chance to go back, I did not think twice and I worked hard to take every opportunity."
The Spain Under-20 international then thanked Pep Guardiola for entrusting him with the opportunity to play in Saturday's match.
"He asks me to play open and to take on defenders as much as I can," Tello said. "I was a bit nervous in the dressing room when the starting lineup was announced, but right after that I felt just fine.
"I have to thank the trust that Pep had in me."
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