The Blades will head into the League One fixture as the bottom club in the division, having picked up just four points from nine matches.
"Crawley are a very good team," he told reporters. "They are settled and have got a good stability. They have scored a few goals, which is obviously an asset, and have attacking players who can create problems."
"We are very hopeful that we can get the three points based on the last couple of performances," he added.
Crawley are currently eighth in the league table with 15 points from nine matches.