The disgraced TV presenter was rumoured to have accepted an offer from Channel 5 to take part in the reality series, but Collins's agent has denied the claims.
"He was approached by the programme and although he was thrilled to have been asked, he declined the offer several weeks ago," said a rep.
The statement added that the decision was "in no way connected" to a petition from his ex-girlfriend Alex Larke's brother, protesting about him taking part in the show.
Collins was found guilty of harassing Larke at St Albans Crown Court in October.
Celebrity Big Brother returns on Channel 5 on Thursday, January 3.
US reality TV duo Heidi Montag and Spencer Pratt, Steps star Claire Richards, Katie Price, Meat Loaf and ex-Corrie actor Bruce Jones are among the talent rumoured to be taking part.
[Celebrity Big Brother 2012 - Rumoured stars]
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