The midfield duo struggled in their first season in Turin.
"I think they deserve another chance," said Ferrara, a man who was replaced mid-season by Alberto Zaccheroni, in an interview with Radio MilanInter.
"However, we'll have to see in what way new boss Luigi Del Neri will want to play. As a result, perhaps Diego is more at risk."
Del Neri is a 4-4-2 man, whereas Juventus changed to a 4-3-1-2 under Ferrara in order to accommodate Diego.
Juventus have made massive changes at boardroom level this summer and are busy building a new competitive squad.
"There has been a shake-up and I hope things change for the better," added the former Napoli and Juve defender.
"Juventus have gone through difficult times in the past. Although the most recent season was bad, there is no need to throw everything away.
"On a tactical level Del Neri will give his own imprint and there are still some important elements today in the squad.
"Not everything needs a facelift, the side just needs to re-find that winning mentality which is constructed when players marry the ideas of a Coach and they fight for a common cause."