Ishy had previously been with Crystal Palace on trial and although not offered a deal he was invited to continue training and given the opportunity of playing for the reserves.
Charlton then decided to take a look at the youngster they once released, who is well known by Mark Kinsella, now a key part of The Addicks management team.
Walsall having sacked Ishmel still own his registration and have allowed him to play reserve football but are still entitled to a fee should a club wish to sign him for the first team.