Jay Butler and Bob Fraser are back at Rutgers.

Butler will return as the Scarlet Knights’ head strength and conditioning coach, a person with knowledge of the situation told NJ Advance Media on Wednesday night. The university also officially announced Wednesday the hire of Fraser, a veteran linebackers coach and longtime Greg Schiano lieutenant. NJ.com’s Rutgers Sports Insider first reported Fraser’s return on Dec. 18.

Butler’s hire was also first reported by Rutgers Sports Insider. He replaces Kenny Parker, who served as former head coach Chris Ash’s head strength coach for three years. Butler, who played for the Giants, was Schiano’s strength coach during his first stint at Rutgers from 2001-11 and followed him to the Tampa Bay Buccaneers. Butler was most recently the assistant head of physical conditioning at IMG Academy in Bradenton, Florida.

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The head strength coach is considered arguably the most important position for a head coach as they have the most contact with players during the offseason. Rutgers’ winter conditioning program begins next week.

This will be Fraser’s fourth stint at Rutgers; the Allegheny College product was a graduate assistant in 1987-88. He then worked for Schiano in 2006-11 and for former coach Kyle Flood in 2014-15, sandwiching a two-year stint on Schiano’s Tampa Bay Buccaneers staff. Fraser has also worked with Schiano at Ohio State and briefly with the New England Patriots. Fraser comes to Rutgers after a year as an off-field defensive assistant for the Patriots.

“Bob and I have worked together for several years at different stops and it is great to bring him back to Rutgers, a place I know he cares about deeply,” Schiano said in a release. “My faith and trust in ‘Fras’ as a coach and developer of men is unparalleled.”

Schiano has now hired nine of his 10 on-field assistants with one spot left to fill. Rutgers is expected to hire a coach who handles special teams to round out the staff.

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James Kratch may be reached at jkratch@njadvancemedia.com. Follow him on Twitter @JamesKratch. Find NJ.com Rutgers Football on Facebook.