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He is Ajax 's sixth new signing this year , joining midfielder Richard Witschge , defenders John Veldman and Mariano Juan and strikers Tijjani Babangida and Dani .
 John Veldman, Mariano Juan, Richard Witschge, Tijjani Babangida, Ajax, Dani
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:
 John Veldman, Mariano Juan, Richard Witschge, Tijjani Babangida, Ajax, Dani