Sylvia wore the 12 in his 157 matches with Melbourne but that number belongs to Jonathon Griffin at Freo.
Sylvia's new number was worn by Jayden Pitt before he retired due to health issues.
Scott Gumbleton will wear No.19 at the Dockers after wearing No.3 with Essendon.
Matt Taberner was upgraded from the rookie list to the senior list after his debut season and he has also upgraded his jumper number, switching from 42 to 20 (previously worn by Viv Michie, who is now at Melbourne).
New recruit, rookie Michael Wood will wear Taberner’s old jumper number, while Thomas Vandeleur will wear No.43 and Jacob Ballard will wear No.44.
Michael Apeness has been given No.35, Alex Pearce will wear No.25 and Brady Grey has received No.28.
