And after helping Wednesday claim their first points of the season with a 1-0 win over Hull, Johnson has set his sights on securing a long-term deal.
"I'm an experienced player and you can see the signs (of being surplus to requirements at Pride Park)," he revealed.
"Reserve-team football is no good to me and I'd be happy to stay here.
"I'm not just coming up here for a month to then go back to Derby. Hopefully I'll do well and get offered an 18-month contract."