Suarez has never been too far from controversy throughout his career - Liverpool boss Brendan Rodgers often refers to the 26-year-old playing "on the edge" - but Johnson believes that fighting spirit is what makes Suarez so effective.
"I've not known anyone like him in terms of living on the edge and wanting to win so badly," said Johnson.
"There is a fine line and that is probably why some people get frustrated when things aren't going their way - sometimes that's a good thing and sometimes it's not such a good thing."
He added: "Obviously he had a few little mistakes - outbursts - on the pitch but nine times out of 10 he is perfectly normal and that is what we are seeing now.
"Providing things don't stir up again you are seeing what we see every day now."
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