With new best mate Mark Wahlberg locked in place for Transformers 4, Michael Bay has turned his attention to casting the other main roles in the film. You know, besides Optimus and the rest of the ‘bots. Now, according to Twitch, Brenton Thwaites and Nicola Peltz are the lucky recipients of Bay’s approval.

After a typically extensive lengthy screen test process, Peltz is apparently on to play Wahlberg’s daughter in the film, while Thwaites is close to the role of her boyfriend, a race-happy biker.

As for the plot, not much is known yet, but Ehren Kruger’s script is set to carry on the story from Dark Of The Moon, albeit a few years later and with the new human characters alongside Cybertron’s finest

The actors are still relatively unknown, but then you’ll recall that Shia LaBeouf was hardly a household name until Bay and Steven Spielberg plucked him to play with their giant toys.

Peltz has had roles in Deck The Halls and The Last Airbender and is also set to appear in several episodes of the new Psycho prequel series Bates Motel. Thwaites, meanwhile, is a graduate of the Home And Away school of young Aussie actors and starred in recent TV movie Blue Lagoon: The Awakening. But his profile is set to rise next year when he shows up in Maleficent.

Neither has been officially confirmed, so they’re flirting with rumour status still, but given Twitch’s reliable sources on TF4 in the past, we’d expect them to be locked in soon enough.