Quique Setien praised Ansu Fati after the teenage forward helped Barcelona to a 2-1 win over Levante in La Liga on Sunday.
Fati, 17, scored twice in the first half as Barca closed the gap to league leaders and rivals Real Madrid to three points.
He became the youngest player to score a brace in La Liga in the 21st century, breaking a record previously held by Juanmi Jimenez.
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Fati has netted five goals this season and Setien hailed him for stepping up for Barcelona, who are set to be without the injured Luis Suarez until the end of 2019-20.