Cristian Montano ended his Notts County loan spell in stunning fashion on Sunday.
The 19-year-old forward, who can also play anywhere on the left wing, came off the bench to score a sublime goal in added time of the Magpies' 3-0 home win against Hartlepool United, his fourth in eleven appearances.
The League One encounter was filmed live on Sky Sports and is set to be the youngster's last game on loan before he returns to the Boleyn Ground.
Montano had gone close to a goal just two minutes before he found the net, with both efforts a statement of his attacking intent. With a minute of stoppage time played, he picked up the ball on the edge of the area, travelled ten yards and fired an unstoppable drive low to the keeper's right.
It sealed an emphatic home victory that was no more than Martin Allen's men deserved after a convincing performance.
Paying tribute to the talented teenager's contribution, Allen, a former Hammers favourite, said: "Cristan has been a model professional. Down to earth, humble and hard working. He's very popular with the staff and players."
Speaking on Friday about his policy of sending out promising players to lower league clubs, Sam Allardyce said: "We've sent several of our promising young players out to other clubs this season - and they're all doing well which bodes well for the future.
"Take 17-year-old Robert Hall for example. He could have stayed here, played in some Development Squad matches but he's taken the chance to go to Oxford United and scored three goals in five matches so far.
"It's a huge experience for a talented young man like Robert and one which will be invaluable in future, as it will be for other young Hammers, Olly Lee (Dagenham & Redbridge), Ahmed Abdulla (Swindon), Callum McNaughton (AFC Wimbledon), Frank Nouble (Gillingham) and Jordan Brown (Aldershot).
"They will all benefit from playing senior football and we will be watching their progress carefully."