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On 31 August 2006 , he returned to Sunderland under new manager Roy Keane , a former colleague from Celtic , alongside Celtic 's Ross Wallace , for a combined fee of up to £ 1,100,000 .
 organization: Sunderland; person: Roy Keane; organization: Celtic; organization: Celtic; person: Ross Wallace
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 organization: Sunderland; person: Roy Keane; organization: Celtic; organization: Celtic; person: Ross Wallace