Norwich City boss Neil Adams expects to face a Manchester United side buoyed by the dismissal of boss David Moyes.
United legend Ryan Giggs will take charge of his first game on Saturday after being named interim manager.
"It's going to give them a lift. There is no shying away from that," Adams said ahead of the Old Trafford meeting.
"The crowd on Saturday are going to be more vocal than they might have been. Ryan Giggs is a legendary figure there who fans have watched down the years."
Scot Moyes was dismissed on Tuesday just 10 months into a six-year contract and with United guaranteed to record their lowest Premier League points total.
They have won just seven of their 16 home games this season, but Adams, whose side are battling against relegation, expects an improved atmosphere at Old Trafford.
"We've got to go there and put a spanner in the works - spoil the party if you like," he told BBC Radio Norfolk.
"We need to win games and to get points."
Adams, 48, is also new to management, having only replaced Chris Hughton at Carrow Road two weeks ago.
The former midfielder has lost both of his games in charge, against Fulham and Liverpool, and the Canaries are just two points above the relegation zone.
Giggs, 40, who has played 962 times for United, will be taking charge of the side for the first time since stepping up from his player-coach role, and when the two bosses meet on Saturday, they will have 25 days of combined managerial experience.
"We're two vastly experienced Premier League managers now aren't we?" joked Adams.
"We've got two games between us, of which I've got two and he's got none. Football is a strange thing. I don't think too many people envisaged us being in opposite dugouts on Saturday.
"I just hope we catch them too early, before he can get his feet under the table."