19606
He considers Željko Obradović as the ideal basketball team head coach , while he considers Juan Carlos Navarro the most difficult opponent he ever faced as a player .
 Željko Obradović, Juan Carlos Navarro
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 Željko Obradović, Juan Carlos Navarro