After Norwich had struck, Montano collected the ball straight from kick-off and beat six players before rolling it into the bottom right-hand corner to the astonishment of the Little Heath crowd.
Hammers academy boss Tony Carr told WHUTV of the goal: "In the second half they came out and had a little go at us and pulled a goal back to make it 2-1, but Cristian then scored a solo goal straight from our kick-off.
"The ball was touched to him and he literally ran through their whole team to score. It was unbelievable, like Diego Maradona. It was really a terrific goal."