The Frenchman delivered the perfect finish, via the underside of the bar, to secure another three points for Jose Mourinho's men but another resolute defensive performance, and a fifth successive clean sheet, also played a major role.
"It's a difficult place to come," Jones told MUTV. "They throw a lot of bodies in the box, they cross a lot of balls from a wide area, they are a physical team and you have to stand up to it. I think, today, we did that.
"Martial needs one chance and he scores and that is why he is so crucial for us at the moment. He doesn't need a second chance, his finish was terrific as well.
"When the game is 1-0, you feel strong, you feel good but there is always that vulnerability in the back of your mind," he added. "They could score at any minute or get a little ricochet and it goes in, but thankfully it wasn't to be.
"The character, the determination, the fight, the willingness to close down from us was terrific and, when you come to places like this, that is exactly what you have to do. I am pleased for the lads."