Patrick Cripps and Sam Docherty have been named co-captains for the second straight year, flanked by veterans Marc Murphy and Ed Curnow.
Another former No.1 draft pick, Jacob Weitering, and veteran defender Liam Jones join Walsh as the three new additions to the seven-man group.
"This is a significant step in the growth of our football club with our emerging generation of talent now ready to step into senior leadership positions," Docherty said.
"Weiters, Jonesy and Walshy are exceptional leaders in everything they do, whether it be on the training track, during games and living the values of our football club ? that is why they have earned their place in the leadership group.
"All three of them are born for the role, are quality Carlton people and we are excited to see them continue to grow as footballers and as individuals."