The Magpies have lost three in a row in the league, failing to score in each game, and fell into the bottom half of the table, while just a month ago they were in play-off contention.
Martin Allen's side, on the other hand, have picked up 12 points from six games to climb to 11th and are in good form.
"Barnet will think it's a good time to play us but we'll go there believing we'll get something from the game," Sheridan told the Nottingham Post.
"We'll be fighting. I want us to pick up. If we play as we can we can beat anyone in the league. If we play like we did at Blackpool and Newport we'll get nothing."
Sheridan also praised Allen, who previously managed the Magpies, for changing the mentality of the Hive Stadium side.
"I like Martin. I get on well with him," he said.
"He gets his players really pumped up. They've had a great result against Plymouth (on Tuesday) and John Akinde is on fire. We've got to deal with him on the day.
"He's a great threat. Martin will have them believing they can get out the league."
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