The first leg of the Blaugrana's quarterfinal tie against PSG takes place on Tuesday, but Tello has made it clear the team is taking things one game at a time.
"We are very focused on the league. Each match is a final for us, and we want to win as many points as possible," Tello said at a press conference.
"Celta are fighting for their lives and they will be a difficult rival to defeat."
The 21-year-old has netted four goals in 14 Liga appearances so far this term, and he is pleased with his performances this campaign.
"In general I’m very pleased with my season," he said. "I want to thank the managers and players for their confidence in me, I want to continue learning from them."