Smith joined the Addicks from non-League outfit Tooting & Mitcham in February after impressing manager Alan Pardew during a two-week trial at Charlton's Sparrows Lane training ground.
The Addicks boss told the official club website: "I just didn't think they were going to feature in our first team this season.
"It's a tough budget for us this year and I couldn't afford to take on anyone who I didn't feel could play in the first team."



