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JACKSONVILLE, Fla. — The Jacksonville Jaguars fired offensive coordinator Greg Olson on Saturday, one day after head coach Gus Bradley said he didn’t anticipate any staff changes.

Quarterbacks coach Nathaniel Hackett has been promoted to take over playcalling duties. He previously served as the offensive coordinator with Buffalo in 2013-14 under head coach Doug Marrone, who is now the Jaguars’ offensive line coach.

Olson was hired in January 2015 and his first season with the Jaguars was a success. The Jaguars ranked 18th in total offense and quarterback Blake Bortles set franchise records in passing yards (4,428) and passing touchdowns (35). The offense has struggled this season, however, and Bortles has looked the way he did as a rookie in 2014.

The Jaguars are 31st in the NFL in rushing, last in third-down conversions, 25th in total offense and 13th in pass offense. Bortles has completed 60 percent of his passes for 1,904 yards and 12 touchdowns with nine interceptions, but he has compiled most of those stats while playing with double-digit deficits. He has thrown seven TD passes when the Jaguars have been trailing by 10 or more points.

The offense hit a low point in Thursday’s 36-22 loss at Tennessee, gaining only 60 yards and trailing 27-0 in the first half.

Bradley hired Olson to replace Jedd Fisch, whom Bradley fired after two seasons. Bradley and Olson previously worked together on the Tampa Bay Buccaneers staff in 2008.

Olson spent the 2013-14 seasons as the offensive coordinator for the Oakland Raiders after a one-year stint as the assistant head coach/quarterbacks coach in Jacksonville under then-coach Mike Mularkey.

Olson also served as the offensive coordinator in Detroit (2005), St. Louis (2006-07) and in Tampa Bay (2009-11).