Shortly after graduating NIDA, Lees began appearing in television in 2008. His first role was several guest appearances on popular soap opera Home and Away, in which he played Nathan Cunningham, a university student and residential advisor. He has also made guest appearances on television series City Homicide, H2O: Just Add Water and The Pacific. In 2009, Lees joined new Nine Network series Rescue: Special Ops, his first leading role, playing Chase Gallagher. His role in the show has earned him notability as an actor.
Lees also appeared in the theatre production of A Midsummer Night's Dream in 2009.
In 2011 Lees featured in a trio of short adverts for the Australian travel company STA Travel Australia STA Travel, titled "Move", "Eat" and "Learn".
- 2008: Flame of the West ... Davo (short)
- 2008: Home and Away ... Nathan Cunningham (4 episodes)
- 2009: City Homicide ... Constable Jake Lockwood (1 episode)
- 2010: The Talk ... Man (short)
- 2010: H2O: Just Add Water ... Ryan (7 episodes)
- 2010: The Pacific ... Robert Oswalt (3 episodes)
- 2009 - 2011: Rescue: Special Ops ... Chase Gallagher (main role)
- 2013–present: Dance Academy ... Wes Cooper
- 2015: The Originals ... Lucien Castle (recurring role)
- He played together with Phoebe Tonkin in the Australian TV series H2O: Just Add Water as a recurring character named Ryan.
- He is a fan of both The Vampire Diaries and The Originals, as he admitted on Twitter he binge watched both of them.
- He has met all of the current regulars of The Vampire Diaries.