Bret Thornton joins young guns Dennis Armfield and Paul Bower is signing new two-year deals with Carlton.
Young guns Dennis Armfield and Paul Bower also agreed to extend their current contracts by two years on the weekend.
"Bret is now one of our senior players and while still young at just 25 years of age, he is one of the oldest players on the Carlton list," general manager of football operations Steven Icke said.
"Dennis and Paul were both recruited to the club from Western Australia. While Paul's development as an attacking defender has been on show this season, equally impressive for us has been the development of Dennis in his second season in the AFL."