Mattheos was placed on waivers by Carolina on Wednesday, Walt Ruff of the Hurricanes' official site reports.
Mattheos signed a one-year, two-way deal with Carolina on Monday.
Mattheos has been added to Carolina's training camp roster, Michael Smith of the Hurricanes' official site reports.
Mattheos will miss training camp as he completes treatments for testicular cancer.
The Hurricanes inked Mattheos to a three-year, entry-level contract Thursday.
Mattheos had a hat trick and chipped in an assist in WHL Brandon's 6-5 win over Saskatoon on Saturday.