Hernandez, who takes penalties for his national team, said he had no doubts about taking the spot kick against Stoke.
"There are a lot of players here who can take penalties here," he said.
"Sometimes it's Wazza (Rooney), sometimes it's Ryan Giggs. Today it was me and Berbatov.
"I take them for Mexico and I'll be ready if [United] ask me again. If they want me to shoot one, I'll shoot."