Jackson will pitch behind opener Brusdar Graterol in Friday's game against the Rockies, Jorge Castillo of the Los Angeles Times reports.

EDGE Analysis

The 25-year-old will serve as the primary pitcher in Friday's series opener, but Graterol will begin the game on the mound. During Jackson's major-league debut in mid-August, he allowed two hits and four walks while striking out five in four scoreless innings.