The former Leeds United and Norwich City star is well known for his tough-tackling approach and he picked up his fourth yellow card of the season in mid-October.
Another yellow card before the November 30 cut-off period would have seen him serve a one-match ban but he avoided a card during Saturday's 1-0 win over Norwich.
Derby next take on Wigan next Saturday, a game Johnson will be available for with the 29-year-old claiming he had to change his approach to make sure he did not hurt the team.
He told the Derby Telegraph: "I've been on that fourth booking for a while now.
"The manager (Steve McClaren) and the backroom staff have told me before every game to make sure I stay on my feet and don't get booked.
"It's hard when you're a defensive midfielder, because you've got to make the tackles and break up play.
"I've managed not to get booked - and that's down to me. I've been a lot more calm than I have been in previous games.
"But I'm happy it's over now and, hopefully, I don't get to 10!"