A mystery fourth team is making a "very strong" bid to acquire Jose Fernandez from the Miami Marlins, according to sources.

Other clubs claim the Houston Astros are that team, but nothing has been confirmed.

The Los Angeles Dodgers, Arizona Diamondbacks and New York Yankees are all known to have spoken to the Marlins about Fernandez.

Miami has publicly said they aren't making Fernandez available, while entertaining trade talks.