Chris Wilder believes the Blades will face a tough test against Ipswich Town at Portman Road on Saturday.
Despite Town propping up the division at present, Wilder is mindful that they could mount a revival under new management, especially following a first home win of the season last time out.
The Blades chief commented: "I know Paul (Hurst) really well and it was always going to be a difficult job for him, changing a lot of things and trying to bring in his own players.
"Obviously they didn't get off to the best start and they didn't pick up the points they'd have expected to.
"They are in a difficult position, but since Paul (Lambert) has come in the spirit is there, the commitment is there and strangely there is something of a feel good factor around the place, boosted by a win over Wigan."
Wilder added: "We're going to come up against a group who will want to prove people wrong, they will have been written off, but that's a dangerous attitude to have going down there.
"The atmosphere is not toxic though the support to the players is positive and the players are feeding off that under a new manager, they will want to get on a roll and scare the teams above them."