Aaron Boone struggled during a Tuesday afternoon news conference to describe Giancarlo Stanton's shoulder injury, but the Yankees remain unconcerned about Stanton's health, and consider him to be progressing.

According to people familiar with the situation, Stanton's shoulder discomfort -- which the team called a shoulder strain shortly after Boone was unable to name the injury -- is not serious enough to prevent him from facing live pitching in Tampa.

If he continues in this vein with no setbacks, he should be in extended spring training games in a week or so, then would begin a rehab assignment.