The Colombia international fainted at the Serie A club's Vestina di Montesilvano training complex and was quickly taken to a local hospital in an ambulance.
But club doctor Ernesto Sabatini moved to allay fears after visiting the 19-year-old yesterday [Tuesday] afternoon.
"It was probably a food allergy," Sabatini told La Repubblica.
"The player will be discharged tonight [Wednesday] after being administered an IV drip and being checked over again."
Quintero is set to spend the next few days recovering and is therefore unlikely to feature against Juventus on Saturday night.