If Bruce Arians returns to coaching, it will only be to fill the vacant Cleveland Browns head coaching position, according to Ian Rapoport of NFL.com.
Ian RapoportFrom @NFLGameDay: Retired coach Bruce Arians tells me he'd come back for just one job -- the #Browns. .... Meanwhile, #Jaguars coach Doug Marrone isn't going anywhere, despite the team's losing streak. https://t.co/jfqG8vXBFy
Per that report, Arians is "very serious" about potentially coaching the Browns and said the main reason he has interest in the position is because of the fans and the environment in Cleveland.