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He made his professional debut for the club on 6 December 2011 , aged 16 years and 278 days , coming on as a substitute for Robinho in a UEFA Champions League group stage match against Viktoria Plzeň , which ended in a 2 – 2 draw .
 Robinho, UEFA Champions League, Viktoria Plzeň
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:
 Robinho, UEFA Champions League, Viktoria Plzeň