Twenty-five-year-old Ilesanmi began his career in the AFC Wimbledon academy, making his first-team debut in 2007.
After impressing while at the Dons, he was snapped up by QPR at 16 and went onto play for the under-18 and reserve sides.
After being released Femi dropped back into non-League football and started the 2010 season with Ashford Town (Middx) in the Ryman League. It was here that his performances caught the eye of John Still, who took him to Dagenham & Redbridge in 2010.
Over the next four seasons he went on to make over 100 League appearances for the Daggers before joining York on a two-year deal in 2014.
The full-back left York this summer after playing seventy games for the Minstermen over the last two seasons.
On the arrival of Ilesanmi, Garrard said: “Femi was a player I knew about from my time at Wimbledon and he’s gone on to play over 180 Football League games since. He’s now at an age where he can hopefully push on with a wealth of experience in his locker and I expect him to impress me and challenge for a starting position. I’m happy to of got the deal done and feel we’ve got a very good squad balance”.