The goalkeeper pulled off a stunning penalty save in injury time to deny West Ham captain Mark Noble from earning his side a point at the London Stadium.
Our no.1 dived to his left at full stretch to secure a vital victory on the road as the Reds maintained an unbeaten start to the Premier League season with a 2-1 triumph in east London.
Following the heroics of De Gea, the United boss was delighted with the Spaniard when conducting his post-match interview with MUTV.
"You know he's a top keeper, everyone loves having him behind them," the boss emphasised.