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After being linked to numerous big name strikers such as Bojan , Ruud van Nistelrooy and Christian Vieri throughout the summer , Blackburn finally secured the signings of Franco Di Santo on loan and the permanent signing of Croatia n striker Nikola Kalinić in early August .
 Ruud van Nistelrooy, Christian Vieri, Blackburn, Franco Di Santo, Croatia, Nikola Kalinić
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Ruud van Nistelrooy, Christian Vieri, Blackburn, Franco Di Santo, Croatia, Nikola Kalinić