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The start of the 1997-98 season saw Petterson as Charlton 's first choice keeper , but lost his place to first Salmon and then Sasa Ilic and was allowed to join Portsmouth on loan in November 1998 as cover for Alan Knight .
 Petterson, Charlton, Salmon, Portsmouth, Alan Knight
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Petterson, Charlton, Salmon, Portsmouth, Alan Knight