Melbourne have appointed Jesse Bromwich and Dale Finucane as the club's vice-captains, for 2019, according to a report by NRL.com.
Smith will retain the captaincy for with Bromwich and Finucane set to take on extra off-field duties. It is the first time Melbourne have named co-captains since 2007.
Will Chambers and Kenny Bromwich round out of the revamped five-man leadership group following the departure of Billy Slater, Ryan Hoffman and Tim Glasby.
Bromwich and Finucane have been considered the front-runners to replace Smith as skipper, with Craig Bellamy previously giving his endorsement to the former.
Smith has now captained the Storm an NRL record 281 games as he approaches his 400th appearance for the club.