The midfielder was substituted as the league leaders have to leave it late to triumph.
Suarez and Valverde come to defence of Coutinho as Barcelona mount fightback against Alaves
Record signing Philippe Coutinho will need time to settle into the Barcelona side after he made a quiet Primera Liga debut in a 2-1 win against Alaves on Sunday, manager Ernesto Valverde said.
All eyes were on the £142 million (Dh737m) midfielder but he was substituted in the second half for striker Paco Alcacer as Barca chased the game after falling behind to John Guidetti's 23rd minute opener, eventually mounting a comeback with goals from Luis Suarez and Lionel Messi.
Coutinho, playing on the right of midfield, linked up well with his new teammates but failed to make a significant impact on his full debut at the Nou Camp after making his first appearance as a substitute in Thursday's 2-0 win over Espanyol in the Copa del Rey
"Players aren't machines that you can just put in a factory and start to work right away," Valverde told reporters in defence of Coutinho.
"I thought he played well, he was always asking for the ball. He has important skills, the other day he played 20 minutes, today he played a little more, he's growing into the team little by little."
Coutinho's former Liverpool teammate Suarez also backed the Brazilian.
"It's always difficult to make your debut at the Nou Camp in the league," Suarez said. "He played very well, trying to run the game and the team is happy with what he did."
Of the result, Valverde said: "It was a complicated match. They made it difficult by taking the lead. We had to keep pressing until the end to get the victory."