Talking ahead of the match, Wellens said: 'Derby had a good result last time out but they are up and down.
'They got beat 6-1 the week before so, if we are going to get to where we want to be, then we have to beat teams like that.
'I don't see why we can't reach the play-offs. We have played some of the top teams, Like Newcastle away. We were probably not at our best that day but we should have got something out of the game.
'In this league, anyone can beat anyone.' Wellens added.
The club have announced they are expecting a bumper crowd on Saturday.