Jason Grilli beginning minor league rehab assignment Saturday

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After suffering a right forearm strain in July, Pirates closer Jason Grilli vowed to make it back before the end of the season. And he’s well on his way to meeting that goal.

According to Tom Singer of MLB.com, Grilli will begin a minor league rehab assignment with Double-A Altoona today and throw around 20 pitches. He’s expected to make another appearance on Monday before moving up Triple-A Indianapolis on Wednesday. He could be cleared to return after that if all goes well.

Grilli was one of game’s the best feel-good stories prior to the injury, posting a 2.34 ERA, 30 saves and a 66/10 K/BB ratio over 42 1/3 innings while earning his first All-Star selection. Mark Melancon has filled in quite nicely as the closer, but having a healthy and effective Grilli back would provide a nice boost in the late innings.