Sometimes the computer will randomly assign one like week 1 or 2 of the regular season. Sometimes you just have to roll without one.  I honestly just replace my coordinators every off season now during the staff week. The whole coordinator thing was implemented so half assed. I also miss when the coordinators would be former players, it's funny but I used to hire Vrable as my d coordinator all the time after he would retire in the game back in the day.