323725
Based on the National Football League , the game was a follow up to Sega 's only football video game for the Sega Saturn , NFL '97 .
 National Football League, Sega, Sega
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 National Football League, Sega, Sega