New York Yankees' fans may have noticed shortstop Didi Gregorius with some awkward, and sometimes weak throws to first base in the final few games of the ALDS with the Boston Red Sox.

It was for good reason. Didi tore the ulnar collateral ligament in his throwing elbow and is scheduled to undergo Tommy John Surgery.

The team announced Friday that an MRI had revealed a tear in Gregorius' right ulnar collateral ligament. The Yankees believe Gregorius sustained the injury while making a throw from the outfield at Fenway Park in one of the first two games of their American League Division Series loss to the Red Sox. Gregorius then played through the UCL tear for the rest of the series, but he didn't look like himself in the field, notably bouncing a pair of throws to first base in Game 4 at Yankee Stadium.

Amazingly, Yankees manager Aaron Boone says Gregorius never complained about the injury and played through it.

A timeline for his return to the lineup in 2019 depends on several factors, team officials said. But the possibility of Didi not returning until the All-Star break or later isn't out of the question, according to reports.

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