Cristian Montano has become the third young Hammer to leave on loan after signing for a month-long stay at Notts County.
The League One club, managed by former West Ham United favourite Martin Allen, swooped to take the Colombian-born attacker on a temporary basis after his impressive summer's work under Sam Allardyce.
Montano, who will not turn 20 until December, has yet to make his league bow for West Ham, but has figured regularly in pre-season.
His Magpies debut could come at Carlisle United on Saturday. Notts County is a club well known to Allardyce, with the manager having taken charge of the Meadow Lane team between 1997 and 1999.
Montano joins fellow loanees Olly Lee, who is on a month's loan at Dagenham & Redbridge, and Jordan Spence, who is to spend the whole season at Bristol City.