The Hammers will face Charlton in the Premiership tomorrow.
Ferdinand told The Sun: “We did let Pardew down. I can only talk for myself but when I pull on the claret and blue shirt I have my pride no matter who the manager is.
“I was gutted when he got the sack – he did a lot for me. Glenn Roeder did a lot for me putting me in the first team but that was at right-back.
“Pardew gave me the run of games that let me establish myself in the position where I know I play best.
“As soon as Pardew saw me play at centre-half for the Under-21s when I made my debut against Ukraine, he put me there for West Ham.
“He rang me in the morning and said on the following Saturday I’d be playing centre-half for West Ham. That showed how much loyalty he had for me.”