De Gea revealed Chicharito's positive approach rubs off on his teammates.
He told Inside United: "Chicha is very important both on and off the field for his bright and positive attitude.
"You only have to look at how he goes about his work and how upbeat he always is. It inspires you to train and play hard and it's a real pleasure to play alongside him and have him as a team-mate. In terms of goals scored per minutes on the field, I think he's the best in the league, and that's what it's all about. He hasn't had many good runs of games but whenever he has featured, he's always scored and as a result picked up plenty of vital points for us."