The 22-year-old defender impressed during a trial with the Gills and has agreed a two-year contract.

Stockport paid �70,000 to sign Jackman from Villa in 2003 and last season he made 35 appearances and scored two goals for the club.

Jackman's performances at left-back had attracted the interest of Bournemouth and Yeovil, who he nearly joined on transfer deadline day.