From Jeff Passan:
Multiple teams, sources said, worry about Contreras — who is not known for his game-calling acumen — meshing with a new pitching staff on the fly. The number of teams with World Series aspirations that could use a catching upgrade isn’t huge, but the New York Mets and Houston Astros have been in contact with the Cubs about the 30-year-old free agent-to-be, sources said, and the San Francisco Giants are poking around on catching options, too. Other teams could seek Contreras more as a bat with the ability to play catcher rather than acquiring him as a primary backstop.