Speaking on Rio Reacts, Ferdinand said: "Ruben Amorim, I think he went a bit defensive. I think he went a bit conservative.
"I don't think the result will determine his future. I don't think any type of result or performance will affect him going into next season. I think he was definitely assured of that.
"He didn't want to come in the first place at this part of the season that they got him because he knew he wouldn't have had a pre-season. He knows the importance of a pre-season.
"If you can switch it and try and find a positive from not being in the Champions League next season and not being in Europe is that he is going to get more time to coach the players on the pitch, less games, less midweek games that he's going to get time to coach these players and then there's no excuses.
"These fans, me and Scholes were sitting there and some of these players are getting songs sung after him. The managers got a song sung after him. They're languishing in the league. They're coming out in their thousands still and supporting this team. These guys need to start giving them something to sing about and justifying why they got there."