Geelong's Cory Gregson has undergone his fourth round of foot surgery, forcing him out of the remainder of the 2018 season.

Gregson's unwanted run of injuries has continued with the Cats small forward suffering a fresh stress fracture in his left foot.

Gregson has previously battled with the constant foot injury between 2016-2017, where he had three separate surgeries in an attempt to heal the ongoing navicular bone stress fracture.

Geelong coach Chris Scott confirmed on Monday night on Fox Footy's AFL 360 he won't take the field again in 2018.

"He has had surgery on his foot again after missing many years of footy," Scott said.

"You could make a strong argument that navicular stress fractures are a more serious injury than an ACL."

After finishing the July 8th VFL fixture against Frankston on the sidelines, Gregson was sent for scans after a second week of soreness in the foot.

The 21-year old is out of contract at the end of the season, but remains hopeful in securing a new contract with the Cats after showing faith in the small forward throughout all his injuries.

Gregson made a return to AFL level in Geelong's opening game against Melbourne this season, after spending a total of 638 days on the sidelines.

Having played nine games for the Cats this season, Gregson was dropped for the round 11 clash against the Gold Coast Suns and now won't be able to make a comeback to the team in the later parts of the 2018 season.