Blades boss Nigel Clough says the 'form book' will count for nothing when South Yorkshire rivals Barnsley visit Bramall Lane on Saturday.
Looking ahead to the clash with the Reds and the return to S2 for Tykes boss Danny Wilson, Clough remarked: "It is a cliché, but the form book does go out of the window, when a team is struggling the game you want is a local derby because they are so unpredictable.
"Danny will be demanding that extra few percent from his players, but let's not forget he was a very good manager for the Blades and under different circumstances he could have won promotion on a couple of occasions here."
On Barnsley's main threats and what he wants to see from his players, Clough added: "Danny (Wilson) is revamping a team at Oakwell following relegation from the Championship and as we know from experience that takes time.
"Their form has improved of late as things are settling down there and we have seen our form also improve as players find consistency.
"They have got some match winners in their team, Winnall and the lad Cole are two of the liveliest strikers in the league and they also have Leroy Lita within their squad.
"It will be a cracking atmosphere, you are never sure how the game will pan out, but one thing is for sure, Barnsley will travel in big numbers and Bramall Lane will be rocking.
"They like to get the ball down and play, just like ourselves, so hopefully we will keep our heads, avoid any rash decisions or tackle and play the game, not the occasion, just like we did at Bradford as opposed to the Chesterfield game."