Latics face Mansfield, who have won just once since September, in the FA Cup before hosting fellow League Two outfit Chesterfield in the Johnstone's Paint Trophy three days later.
It is the first time in Johnson's entire managerial career that he will face a side in a division below his, yet he considers the difference between League One and League Two as minuscule.
He does, though, acknowledge that players and fans may presume his team will be favourites for both clashes, a judgement he has advised against.
"As a manager you actually don't think about that as much as when you're a player or a supporter," said Johnson.
"We've all seen it in football, we saw it with Oldham beating big clubs (Liverpool) and that goes to show what can happen.
"I don't see the difference between us and Mansfield as being the same as Oldham and Liverpool.
"It's a lot smaller gap between League One and League Two. Outside the top six of League One all the way to probably bottom six of League Two is very similar.
"So they (Mansfield) are maybe the underdogs in terms of terms of positions in the 92 Football League clubs but, certainly if you pitch the two clubs as far as finances, you could go into it saying we're the underdog because they've spent a lot of money on their players."