McClaren insists the culture has to change immediately to get the Red Devils firing again, starting with getting everyone onside during training in a build up to matches.
"These are the things that we need to do, things like we all need to connect with each other," McClaren explained to his son on their McClaren Performance podcast.
"Games are won Monday to Friday, if you get Monday to Friday right, games are won on Saturday. Each and everyone has to bring energy."
McClaren then referenced former Tottenham Hotspur boss Mauricio Pochettino who famously took Spurs to unfancied title pushes in 2016 and 2017 based on a high work ethic system where everyone contributed.
"Pochettino talks about creating the culture, if no one brought energy he got them out, they had to bring some kind of energy to the group," he added.
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