Keane felt the former United boss wasn't backed in the summer transfer market and, as such, missed an opportunity to make his mark on the squad.
"He certainly had a hard start but I'd look at the chief executive (Ed Woodward), he didn't get the deals done," Keane said on ITV.
"I think it's a shame, he should have been given more time. Some of the players should be ashamed of themselves, they really let him down."
Asked how much responsibility belonged to Ferguson for picking Moyes, Keane added: "I wouldn't say that it was his pick. He certainly put his name forward but the club have to make a decision so you can't be critical of Sir Alex.
"For David Moyes seventh in the league is disappointing but you need people around you, the support, and I don't think he's had that, certainly from the players."
For breaking stories and all the great banter like us on Facebook: facebook.com/tribalfootball