Josh Brolin is in talks for 'Jurassic World'.

The 45-year-old actor is believed to be in negotiations for a leading role in the fourth film in the 'Jurassic Park' series, according to The Hollywood Reporter.

This comes shortly after Nick Robinson was cast as the brother of lead actor Ty Simpkins and although the teen star is yet to receive a formal offer from Universal, but it is expected to arrive ''soon''.

Meanwhile, Bryce Dallas Howard - daughter of director Ron Howard - is in negotiations with director Colin Trevorrow for what is said to be the female lead.

Casting is thought to have taken longer than expected, as 'Jurassic World' was originally set for release in June 2014 but was delayed by Universal in order to allow more time to develop the film's script.

Steven Spielberg's original 'Jurassic Park' was released in 1993 to critical acclaim and spawned a 1997 sequel, 'The Lost World'. Spielberg then gave up the director's chair for a third film, 'Jurassic Park III' in 2001, which was helmed by Joe Johnston.

Trevorrow recently indicated he wants to introduce new dinosaurs to the movie's prehistoric line-up, with it rumoured there will be underwater creatures in the new movie.

The director previously revealed Spielberg, who is still a producer on the franchise, has been a great source of support.

He said: ''It's incredible to have Steven, who's done this for decades and has such an incredible film knowledge and just understands the language of the story in a way that for us is very refreshing. It's not like getting notes from a studio executive, it's really just trying to crack this and make it the best it can be.''