The Pirates and Griffin are working to finalize a nine-year, $140 million contract extension, Buster Olney of ESPN reports.
The Pirates already announced that Griffin would be called up to make his major-league debut in Friday's home opener against the Orioles, and it appears the debut will be accompanied by a lucrative, long-term deal. He won't turn 20 until later this month, so Griffin will still be in his 20s when he gets his first crack at free agency. Griffin is set to take over as the Pirates' everyday shortstop after slashing .336/.420/.530 with 21 home runs and 68 stolen bases in his first 127 minor-league games.