Tello struck a hat-trick in Barca's Copa win at Levante.
"Scoring a hat-trick gives you a lot of confidence. I'm very happy because opportunities should be taken advantage of," said the 22-year-old, who gave the credit to Lionel Messi's delivery.
He added on fcbarcelona.com: "He put me through in front of goal three times and I have to thank him for that.
"It is a play we are used to because he's left-footed. To have a player like that on the team is spectacular."
For breaking stories and all the great banter like us on Facebook: facebook.com/tribalfootball