Masahiro Tanaka is headed back to New York after experiencing general arm soreness in his pitching arm while attempting to return from a partially torn ulnar collateral ligament. Tanaka is adamant that it is not specifically his elbow that hurts as much as it is his whole arm, from what he speculates may be due to not pitching for a while, but everyone will collectively hold their breath until it is determined that Tanaka hasn't done more damage to his elbow.
Although Tanaka is not yet scheduled to see any doctors in New York when he returns to work out at the Yankees' facilities, it is expected that that will change to make sure the elbow is still intact. Tanaka says he still wants to return this season but this setback may not allow for that, depending on what is causing the discomfort in his arm. Hopefully it's just a matter of shaking off the rust that comes with not pitching for an extending period of time.
Hopefully the issue proves to be nothing major, as Tanaka himself says that he is not worried. We should know more in the coming days. Until then, fingers crossed.