Let's look at this position by position.
CATCHER
McCann has a club option that I doubt it picked up. (-17,000,000)
Maldonado is a UFA (-3,900,000)
Stassi is under team control. (+ a few hundred K, maybe)
Top Free Agents: Wilson Ramos (31), Yasmani Grandal (30), Matt Wieters (33), Jonathan Lucroy (33), & Devin Mesoraco (31). Ramos & Grandal would be nice hitting upgrades, but catchers don't age well. I would be cautious signing anyone to a long-term deal.
On the Farm: Garrett Stubbs (25) is an okay prospect. He's getting up there in age. His line in triple-A - .310 .382 .455 .836
We have almost 21 million coming off the books here. Stassi is just a guy. Stubbs will be given a shot, but ultimately I think we will need to sign or trade for someone. Maybe re-sign Maldonado to a 1-year deal and let him compete with Stubbs. If that works then we'll have some money to use at other need positions (see SP & DH).