[12] He had a reasonably successful two-year spell at Rochdale scoring the goal in a 1–0 win at Kidderminster that secured the team's League status in 2003–04, but fell out of favour the following year and was released.

Fans bemoaned the fact he failed to find the back of the net given the number of good scoring opportunities.

On 24 January 2008, Bertos was signed on a free transfer by his hometown club Wellington Phoenix on a two-year contract.

[15] He made his debut in a CFL match against Techno Aryan on 23 August 2014, coming as a substitute for Mehtab Hussain.

[16] As the Indian Super League started, Bertos joined the competition by going on loan to NorthEast United.

[17] Bertos signed for Australian National Premier Leagues side Hamilton Olympic for the 2016 season after training for several weeks with Newcastle Jets.

[21] He provided the assist for New Zealand's first two goals against World Champions Italy in a 4–3 friendly loss in Pretoria prior to the Confederations Cup.

In Wellington on 14 November 2009, Bertos provided the assist and delivered the corner from which Rory Fallon headed a thumping game winner against Bahrain to give New Zealand the two-legged aggregate win needed to secure a spot at the 2010 FIFA World Cup.

The squad played several official warm-up internationals against Australia, Serbia, Slovenia and Chile before the World Cup.

Bertos was named in the New Zealand Futsal squad to play Australia in a three match series in July 2014 scoring a goal in his debut for the side[23] Bertos was named the coach of Weston Bears in January 2020 after former manager Kew Jaliens flagged an intention to return to Europe.