141709
He currently holds two records : the youngest Czech Republic U21 national team player ( age 17 ) and the youngest Gambrinus Liga player ( age 15 years 322 days ) .
 Czech Republic U21 national team, Gambrinus Liga
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Czech Republic U21 national team, Gambrinus Liga