8798
He joined the club because of the injury to the defender Miguel Riffo and he wears the number 33 shirt , due to the other numbers being in use by many players .
 Miguel Riffo
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:
 Miguel Riffo