As of right now, in terms of who the Yankees are paying in 2020, their outfield will consist of Aaron Hicks, Aaron Judge, and Giancarlo Stanton. With all three of these players very injury-prone—and Hicks start to start the first half on the injured list—the fourth outfielder will play a critical role in 2020.
There are a few different routes the Yankees could go down when it comes to who that fourth outfielder will be. The first option is Brett Gardner. Gardner is a free agent and would almost definitely re-sign with the Yankees no matter the price.