Declan Rice insists West Ham boss Manuel Pellegrini will be just as demanding for Wednesday's Carabao Cup tie at Oxford as he was ahead of the victory over Manchester United.
The Hammers ran out comfortable 2-0 winners at home to Ole Gunnar Solskjaer's side on Sunday to continue a fine start to their Premier League campaign.
Just one defeat from their opening six games has left West Ham fifth in the table as they prepare for a third-round clash at the Kassam Stadium.
Sunday's game was West Ham's third league clean sheet in a row, something they have not achieved since December 2017.
England international Rice believes keeping things tight at the back is playing a huge part in their upturn in form as Pellegrini instils a winning ethos into the squad.
"That mentality not to concede is there," he added.
"When was the last time we kept three clean sheets in a row? As a West Ham player, I know that never really happens, so that's a massive bonus.
"We're working so, so hard from back to front and every time we step out on that pitch the manager is giving us the belief we can win."
Rice is unlikely to feature at Oxford as Pellegrini shuffles his pack with the likes of Roberto, Fabian Balbuena, Carlos Sanchez and Albian Ajeti all pushing for rare starts.
