Tony Bellew will consider moving up a division after his second challenge for a light-heavyweight world title ended in defeat.
The Liverpool fighter was stopped in six rounds by WBC champion Adonis Stevenson in Quebec City.
The only other defeat on Bellew's 20-2-1 record was dropping a majority decision to British rival Nathan Cleverly for the WBO version of the light-heavyweight title two years ago.
Cleverly has since lost that belt to Sergey Kovalev and will campaign at cruiserweight when he resumes his career, a route that Bellew also looks set to take.
"It wasn't supposed to be," Bellew told Sky Sports after his defeat to Stevenson.
"Maybe it's time for me to jump up in weight now. Someone else has recently jumped up in weight and it might be time for me to do it."
Bellew admitted he had felt the punching power of Stevenson, who has 20 knockouts in his 23-1 record.
"Might it have been one too many (fights at light-heavyweight) for me? I was feeling them tonight and it's not like me to feel shots. Tonight I did," said Bellew.
"I'm at the pinnacle of the sport. I've gone in with the premier fighter in the division and good luck to him, he came out on top tonight, it wasn't my night."
Bellew later tweeted: "I'd like to apologise to everyone for not doing what I said I would do! I gave it everything and the better man won and that's it. Gutted.
"The fans who travelled, I'll be forever in your debt I'm truly shocked.. Like I said the better man won, no excuses. Thanks again for support."
Should Tony Bellew move up to cruiserweight?