He enhanced that reputation by claiming the Golden Boot at this summer's Gold Cup, only for the rapid development to be halted by the injury that came as a surprise, even for Hernandez given he walked out of the Red Bull Arena the day before United's hammering of the MLS All-Stars not feeling too bad.
"It was a header but the ball moved a little bit and I didn't head it well," recalled Hernandez, who will be again reduced to the role of spectator for United's opening home league game against Tottenham this evening.
"I went back to the hotel and had dinner but I started feeling bad. I went to my room to rest but I had to call the doctor and they took me to hospital.
"I just need to look forward, get my confidence and start heading the ball again."