Hossa spent the final minute of regulation and nearly all of overtime in the penalty box before his game-winning goal gave the Hawks a 5-4 win and a 3-2 series lead.
Hossa was whistled for boarding Dan Hamhuis after he appeared to shove the Predators' defenseman from behind into the endboards.
"What's the difference between that one and the [Blackhawks defenseman Brian] Campbell hit?" Trotz said. "I don't see the difference between the two. I trust the league's judgment. It's unfortunate Hossa comes out and scores the winner. Ironic how that works."
Hossa said after the game he was just playing the puck.
"I tried to go for the puck and the guy turned his back to me and I couldn't stop the motion. I didn't want to hit him like that," Hossa said. "I can't worry about it. It's up to them [the league] but I hope I'll be playing [on Monday]."
Campbell, who returned to action in Game 4 of the series, has been out since March 14 after Washington's Alex Ovechkin shoved him from behind into the boards and broke Campbell's clavicle and rib. Ovechkin was given a two-game suspension by the league and a similar punishment for Hossa could end the Slovak's season if Chicago can't close out Nashville in the first round.
"It couldn't be a better ending than this," Hossa said.
Hossa returned to the ice immediately after his penalty expired and put himself in position to win the game. He got the puck on the left side of the net after a shot from teammate Brent Sopel appeared to deflect to him off the stick of Nashville's Joel Ward.
Hossa then slid a shot past Nashville goalie Pekka Rinne for his second career postseason overtime goal.
"When I saw the puck coming to me, I just tried to put it in. What a relief. A huge win," Hossa said.
Hossa's goal was his first of this postseason. He also has three assists.
Jesse Rogers covers the Blackhawks for ESPNChicago.com. The Associated Press contributed to this report.