Jackson was optioned to Triple-A Sacramento on Wednesday, Kerry Crowley of The San Jose Mercury News reports.

EDGE Analysis

Jackson was promoted from Triple-A last week and has delivered a scoreless outing in 10 of his past 11 appearances. Overall he has a 3.74 ERA, 1.25 WHIP and 28:12 K:BB in 21.2 innings this season and remains a strong candidate to rejoin the big-league club.