England international states that the Frenchman was being clever by not fully extending his arm, and claims he "probably stayed up all night thinking about how to do that"
Suarez, who was banned for eight games after being found guilty of racially abusing the United left-back in the reverse fixture at Anfield earlier this season, refused to shake the player's hand before the clash at Old Trafford.
Johnson did not see the initial incident but has since watched it back on television, and claims Evra "probably stayed up all night" thinking about how to shake hands with the Uruguayan.
"Evra was clever at Old Trafford," Johnson told the Daily Mail. "Because - I'm not being funny - but if I wanted to shake your hand I would stick it right out in front of me. But if my hand is down almost by my side, then it's because I really don't want to shake your hand.
"Luis didn't shake because Evra's hand was down there. What else is Luis supposed to do? Would you go to shake someone's hand if it is way down there by their side? Course not.
"He's following Luis with his eyes as if to say: 'Right, he's gone, so I'll pull him back now...' Evra probably stayed up all night thinking about how to do that. The whole thing is ridiculous."
Suarez was widely condemned for the incident and, along with the club, later apologised for his actions but Johnson insists that there was not sufficient evidence to find the Uruguayan guilty.
"The evidence was Luis’s word against Evra’s," Johnson continued.
"I’m not saying Evra is lying but it’s his word against Luis’s, isn’t it? So how did it all turn out to be so strong in Evra’s favour?
"I work with the lad every day. There is no way he said that."
Johnson was a member of the Liverpool squad that famously wore t-shirts emblazoned with Suarez's face prior to kick-off against Wigan back in December, and while the former Chelsea man concedes the action may have stoked the fires somewhat, he argues that it was merely a move to show support for their colleague.
He insisted: "With the media these days and the way it was going to be blown up,
"Maybe the T-shirts thing wasn’t the right thing to do. How should I say this? We wore them to show our support for Luis.
"It wasn’t to send a message to everyone else. It was just for him.
"It seemed to come across that we were making a point. We weren’t. It was the club’s idea.
But obviously we all agreed. We didn’t really think about how people would react."