Luis Enrique's side take a 2-1 lead into the second leg of the Copa del Rey quarter-final against and are boosted by the Brazilian's return.
The Brazil captain sat out Barca's 2-1 Liga victory at Malaga on Saturday with a hamstring injury but has been named in Luis Enrique's 18-man matchday squad alongside fellow forward Luis Suarez, who has completed a two-match Copa del Rey suspension.
Sergio Busquets and Andres Iniesta have recovered from a bout of flu, but fellow midfielder Arda Turan is still laid low and will miss the match.
Holders Barcelona take a 2-1 aggregate advantage into the Camp Nou encounter against last season's beaten finalists following last week's first leg.
Munir and Neymar scored first-half goals before prolific striker Aritz Aduriz struck a minute from time to give Athletic hope.