The result on Sunday will be two sides made up of separate generations.
Fati scored three out of Barcelona’s eight goals this season in the league and he booked a place in Koeman’s starting eleven.
Impressive performances from Lionel Messi and Ansu Fati helped Barcelona overcome an early red card to defender Clement Lenglet and win 3-0 at Celta Vigo
The Catalan side are expecting a tough trip to Valladolid as the home team only conceded 14 goals in the league at the José Zorrilla stadium.
The player featured in 25 games in all competitions and scored five goals in his debut season with the club.
Barcelona teenager Ansu Fati scored twice to lead his side to a 2-1 win at home to Levante on Sunday, finding the net in a league game for the first time in more than four months and becoming the youngest player to net a La Liga
Barcelona wonder kid took the league by storm after he was promoted to the Catalan’s first team and established himself as a key player at the first team.