The 23-year-old is believed to be high up on GWS' recruiting list with Giants coach Kevin Sheedy warning Collingwood they were likely to lose a premiership player to the AFL's 18th franchise.
GWS are also believed to be targeting Thomas' teammates Scott Pendlebury and Dane Swan.
Thomas told Nova radio he had not been approached by the Giants and had no intention of leaving the Pies.
"It is my last contacted year, I don’t think it is my last year at Collingwood," Thomas said on Thursday.
"I think it is funny that the papers have written all this stuff and we haven’t heard a thing.
Thomas and Collingwood have yet to start official contract talks but the midfielder pledged his allegiance to the club.
"I haven’t signed, I haven't spoken to even our club ... let alone Greater Western Sydney," Thomas said.
"You can tell Collingwood to start talking contracts if you would like, that would be fantastic.
"Do I want to be at Collingwood? Yes ... for as long as they will have me. It is not all about money, the football business is about winning premierships."
