David De Gea has warned Manchester United that they need to be much more switched on against West Ham to avoid a repeat of last season's 3-1 defeat to the Hammers.
The Red Devils, who were managed by Jose Mourinho at the time, were comfortably beaten by Manuel Pellegrini's side - a result that meant they'd suffered their worst start to a league campaign in 29 years.
And De Gea is aware of the threats posted by the Londoners heading into Sunday's latest Premier League meeting, urging his team-mates to be ready to go from the off.