Leuenberger, 25, has committed to a two-year extension, while Zorko, 24, has agreed to a new three-year deal.
Lions General Manager, Football Operations, Dean Warren said: "Matthew and Dayne's retention was an absolute priority for the Club.
"It's also a significant show of faith by these young men in the Club's directions as well as fantastic news for our members and supporters.
"We're confident they'll both play key roles in future success."
Leuenberger, drafted by the Lions with Pick No.4 in the 2006 AFL National Draft, has stamped himself as one of the game's premier ruckmen, despite an injury-hampered start to his career.
Under the Gold Coast establishment rules, Zorko, a native Queenslander, was eligible to be listed or traded by the Gold Coast. Overlooked for a list place on Gold Coast's initial years, the Lions traded Pick No.34 to the Gold Coast in exchange for Zorko and Pick No.47 during the 2011 Trade Period.
He played a total of 16 games in 2012and averaged 20 disposals, six tackles (second only to Jack Redden at the Club), kicked a total of 16 goals for the year, and took out the Club's Rookie of the Year award.
