There is one head coaching vacancy in the NFL -- the Cleveland Browns'.If the Browns do not hire a San Francisco assistant (the job appears to be wide open but no 49ers' assistants have been connected to the job as of yet), that means Jim Harbaugh's key assistants will return for the 2014 season. Earlier this month, Harbaugh said he thought at least one assistant would get an NFL head coaching job.Offensive coordinator Greg Roman and defensive line coach Jim Tomsula interviewed with Minnesota.