Defender Blumberg, 19, is a graduate of the Nike Academy and signed his first professional contract at the League One club last year. He has been a regular in Charlton’s under-23 team and played the full 90 minutes in the 3-0 defeat against the Dons in the first-round tie.
The former Hakoah Sydney City East centre-back spent almost a year training and playing at the Nike academy at St George’s Park after being selected as the only Australian out of 600 players at the Nike Most Wanted Trials in 2016.
He was offered a contract after being recognised for his leadership skills, dedication to his game and individual quality.
“My dream is definitely to play Premier League,” commented Blumberg.