Smith was reassigned Tuesday to minor-league camp by the Pirates.
Smith (elbow) is being stretched out as a starter in Pirates camp, Rob Biertempfel of The Athletic reports.
Smith (elbow) signed a minor-league deal that includes an invitation to spring training with the Pirates on Thursday, Jon Heyman of the New York Post reports.
Smith has an injured left elbow, Jody Jackson of Bally Sports Arizona reports.
Smith allowed one hit and struck out one over 2.2 innings in Saturday's 2-0 loss to San Diego.
Smith (finger) was reinstated from the 15-day injured list Monday.
Smith (finger) began a rehab assignment Tuesday with the Diamondbacks' rookie-level Arizona Complex League affiliate and struck out three over three innings while giving up one earned run on two hits and one walk.
Smith underwent surgery on his right pinky finger Tuesday, Nick Piecoro of the Arizona Republic reports.
Smith was placed on the 15-day injured list Monday with a fractured right hand.