The former Gills striker, who has had spells in management and coaching at Swindon Town in recent seasons, spent the majority of last season following the Gills' fortunes as a co-commentator for BBC Radio Kent.
Now back at Priestfield in a coaching capacity, Iffy will bring his intelligence and experience to the Gillingham coaching team as they look to push for promotion to the Championship this season.
Welcome back Iffy!