The Melbourne powerhouse and Brisbane force of nature are on a collision course to resume grand-final hostilities after Utoikamanu lit the fuse before the NRL season decider with a suite of verbal barbs.
Tonga and Samoa, who both released their squads on Tuesday, will clash in the Pacific Cup showdown at Suncorp Stadium on October 26.
Both NSW props will be making their respective Test debuts for their countries.
Haas came out on top in the 26-22 grand-final win, while Utoikamanu started well but was underwhelming overall for his high standards.
Before the match he said he would "run at" Broncos he didn't like and accused some of them of being "stuck up".
Haas responded with a warning.
"They can say what they want," Haas retorted.
"We will be out there on Sunday and we'll see if that's still going to be thrown around."
Tonga coach Kristian Woolf said he wouldn't be telling Utoikamanu what he can and can't say.
"I listened to that interview and I thought he maybe could have chosen his words a little bit better," Woolf said.
"I'm sure he's learned from that. I know Stefano. He's very humble and actually very quiet. He will fit into our camp really well."
Tonga have named a strong squad which includes Sydney Roosters strike centre Robert Toia.
The 21-year-old Dally M rookie of the year, had a scintillating NRL season in which he also made his State of Origin debut and was a key figure in Queensland's 2-1 series win.
"What he did in Origin, I thought he was outstanding," Woolf said of Toia.
"I thought he just got better and better with every game, so he's had a great year."
The Tongan squad also includes Warriors wrecking-ball Leka Halasima, who is yet to debut for Tonga.
The 20-year-old announced himself as one of the game's most powerful forwards and will add starch to a monster pack.
The side will be captained by blockbusting forward pair Jason Taumalolo and Addin Fonua-Blake.
The Tongans will visit their homeland from October 14-18 before setting up camp in Brisbane ahead of the eagerly anticipated clash with Samoa.
The Pacific Cup also includes New Zealand. Last year's winners Australia will take part in the Ashes tour of England instead.
TONGA SQUAD FOR PACIFIC CHAMPIONSHIPS:
Paul Alamoti, Kulikefu Finefeuiaki, Addin Fonua-Blake (capt), Moeaki Fotuaika, Leka Halasima, Siliva Havili, Lehi Hopoate, Eliesa Katoa, Isaiya Katoa, Sione Katoa, Felise Kaufusi, Tolu Koula, Isaiah Iongi, Soni Luke, Will Penisini, Jason Taumalolo (capt), Robert Toia, Daniel Tupou, Stefano Utoikamanu, Demitric Vaimauga, Siua Wong.
12°C