Hartson, 40, has been out of football since 2008, but could now his return to former club West Ham as they look to replace Teddy Sheringham.
Sheringham served as the club's forwards coach last season, but left the club earlier this summer in order to become the new manager of League Two side Stevenage.
The Welshman hit 24 goals in 60 games for the Hammers as a player, before spells with Wimbledon, Coventry City, Celtic, West Brom and Norwich City.
With an impressive goalscoring record over his career, Hartson could certainly pass on some words of wisdom for West Ham's strikers - if he does land the job.
Wise move from Bilic
Whilst Bilic returns to West Ham having also played for the club, he's making a smart move by looking to bring in staff associated with the club.
Hartson knows West Ham and knows English football, two factors which will play into his potential move back to East London this summer.
Given Bilic's inexperience in English football as a manager, the Croatian needs to surround himself with familiar faces - and Hartson certainly fits the bill.