Natasha Jonas's trainer Joe Gallagher believes there are signs of weakness in Katie Taylor's armour.
Jonas, who was defeated by Taylor at the 2012 Olympics, fights the Bray woman this weekend at the Manchester Arena on the Derek Chisora vs Joseph Parker card.
"Katie Taylor had an extensive amateur career," said Gallagher.
"Near the backend of her amateur career, she had a few losses that Katie Taylor three or four years [before] wouldn't have lost them fights.
"She's turned professional. In the last few years, you can argue that everybody - apart from a number of people - thought that she lost in New York [to Delfine Persoon].
"She's come back and done the rematch with Delfine Persoon. It was a lot closer than what people were saying it was."
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The 36-year-old Jonas, who is 9-1-1 in her career, turned pro in 2017, seven months after Taylor.
"Katie has had an awful lot of hard fights of late - distance fights," continued Gallagher.
"I'm not talking bad of Katie, because she's a media darling. If this was a male fighter who people think has gone to the peak and is just beginning to show signs [of dropping off], we'd be saying it. No one wants to say it.
"When you sit and study, you see things. Katie Taylor against Delfine Person, round three, she got busted with a shot. No one picked it up. She got busted in another round against Christina Linardatou.
"Katie is a great fighter, but we've done our homework. Katie has trained like a demon for Natasha, and we're going to see the best Katie Taylor that we've seen for a long while. But, [we're also] going to see the best Natasha Jonas.
"The Natasha Jonas now would stop the Natasha Jonas that fought [and drew with] Terri Harper."