Ansu Fati came off the bench to score against Ceuta on Thursday as Barcelona ran out 5-0 winners in the Copa del Rey.
Xavi confirmed after the match that Fati will be in the starting XI next time out when Barcelona take on Getafe in La Liga.
Barca are without Robert Lewandowski and Ferran Torres, due to suspension for the game, and will look to Fati to provide the goals at the Camp Nou.
“We agreed that he would play half an hour because on Sunday he will start,” he said.
“He has come out and made a difference.