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Minor Leaguer A.J. Jimenez is the only other catcher on Toronto's 40-man roster.
Thole, 29, is a career .249 hitter in seven seasons with the Mets and Blue Jays, and he has appeared in a Toronto uniform in each of the past three years.
Cash Kruth is a reporter for MLB.com. Follow him on Twitter at @cashkruth. This story was not subject to the approval of Major League Baseball or its clubs.