Frank Nouble has joined League 1 promotion hopefuls Charlton Athletic on a month-long loan.
The 19-year-old could make his debut in Saturday's home game with Brentford. Nouble had only been back at the Hammers for a week after a similar spell at Barnsley, and captained the reserves in their 1-1 draw away to Sunderland on Tuesday.
The move will reunite Nouble with club-mate Matthew Fry, and also assistant manager Alex Dyer - who left the club last month to become Chris Powell's No2. In all, Nouble played four times for Barnsley, having previously been on loan at Swindon Town earlier this season.