7165
Defenders - Frank de Boer ( Ajax ) , John Veldman ( Ajax ) , Jaap Stam ( PSV ) , Arthur Numan ( PSV ) , Michael Reiziger ( AC Milan ) , Johan de Kock ( Schalke ' 04 ) .
 PSV, AC Milan, Schalke, Ajax, Frank de Boer, Johan de Kock, Arthur Numan, Michael Reiziger, Ajax, PSV, John Veldman, Jaap Stam
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, else, organization, person 
Text: {0} 
Answer:
 PSV, AC Milan, Schalke, Ajax, Frank de Boer, Johan de Kock, Arthur Numan, Michael Reiziger, Ajax, PSV, John Veldman, Jaap Stam