Almost a year ago, the 32-year-old pencilled in the World Cup in Russia as the venue for his last appearence in green and gold. It is understood, however, though he is likely to retire, the decision is not yet set in stone. Until it is confirmed and announced, the national team staff will probably try and convince Milligan to delay his retirement until after the Asian Cup in the UAE.

Entourage: Mark Milligan embraces his family after the draw against Denmark at Samara Arena. Credit:AAP

Sources suggest Milligan is still regarded as a crucial part of Australia's plans for that tournament.

The highly valued veteran is one of the leaders within the national team set-up and his performances in the heart of defence in Russia have been among some of his best for the Socceroos. He has made 72 appearances for his country, scoring six goals and wearing the captain's armband on seven occasions since making his debut in 2006.

In the eyes of many, Milligan was Australia's best on ground in their biggest achievement to date – winning the 2015 Asian Cup final on home soil – despite not being awarded the man of the match. Ever present for the Socceroos over the past six years, Milligan has also been one of Australia's most versatile players – playing regularly at centre-back, in central midfield and defensive midfield, and even deputising at right back.