Sloane and Dangerfield were installed as acting captains when van Berlo suffered a freak injury at training in January, ending his year before it started.
Van Berlo was struck by a weighted sled, which ruptured his Achilles tendon.
The 28-year-old is nearing the end of his rehabilitation in time for a complete pre-season.
Speaking to Adelaide radio station 5AA, Sloane said Van Berlo should captain the side "for sure".
Dangerfield felt the same.
"There's no doubt in my mind that VB is the best leader we have at the footy club," he said.
"The work he's done this season without playing a game and while also managing the disappointment of knowing that the chances of him playing were really low – I couldn't speak more highly of him.
"He's a terrific guy, but an unbelievable leader. While you read and hear the external calls from outside the footy club, internally there is no doubt about who is the best person to lead the Adelaide Football Club.
"It would just be nice if people (outside the club) can follow the same line as the players, because we firmly believe Nathan is the right man for the job."
Twitter: @AFL_Harry
