AUBURN — Barely three weeks on the job, Auburn running backs and special teams coach Rich Bisaccia is leaving for the Dallas Cowboys.

With the departure of Bisaccia, Auburn coach Gus Malzahn announced changes to his staff Friday afternoon with Tim Horton moving from tight ends to running backs and the promotion of director of player personnel Scott Fountain to tight ends and special teams.

“Rich had an offer that he felt he could not turn down and we wish him nothing but the best,” Malzahn said in a statement. “I’m excited that Tim will be coaching our running backs. He has a tremendous track record coaching some great backs and I’m extremely confident that will continue here at Auburn.

“Scott is someone I tried to hire as an assistant coach a year ago at Arkansas State. He is a great coach with a tremendous work ethic, and his strong ties in the state of Alabama will be an asset to our program.”

Horton coached running backs for the past six years at Arkansas where the Razorbacks had four different 1,000-yard rushers from 2007-2010. All-Americans Darren McFadden and Felix Jones and All-SEC backs Dennis Johnson and Knile Davis were among Horton’s pupils.

Fountain served as director of player personnel for the past four years. He coached for 14 years including at Florida State, Georgia Southern, Middle Tennessee, Central Florida and Iowa State, where he served as Gene Chizik’s tight ends coach and recruiting coordinator from 2007-08.

“Excited about Scott being on field now,” Malzahn tweeted. “Great coach, great recruiter, strong ties in AL. Won’t miss a beat! #wareagle”

Before a speaking engagement at the 8th annual Alabama Football Coaches Association Convention held at the Embassy Suites in Montgomery on Thursday night, Malzahn said Bisaccia, who was hired on Jan. 3, was “out recruiting.” It is unclear how much Bisaccia’s buyout with Auburn is or if there was a buyout as he and all of the other Auburn assistants have signed Letters of Agreement, according to a spokesman, but not a contract.

Of the four SEC schools with new coaching staffs, Auburn is the only one which has not released its coaching contracts.

The Dallas Morning News and ESPN Dallas reported Wednesday night Bisaccia, who spent the previous 11 years coaching special teams in the NFL, was a target of the Cowboys for their special teams coach position.

It is unclear if Malzahn is still going to hire Arkansas State wide receivers coach and recruiting coordinator and former Auburn director of offensive quality control Casey Woods, which he said was a “possibility at this point” Thursday night. Woods served under Malzahn last season at Arkansas State and the prior three years as Auburn.