Australia fly in Marco Tilio amid doubts over Martin Boyle’s World Cup fitness

• Hibs winger not currently training due to a knee injury
• Melbourne City 21-year-old on standby as Boyle's replacement

The Socceroos have given their strongest indication yet that Martin Boyle's World Cup is in serious jeopardy, flying Marco Tilio to Doha as a potential injury replacement a week before the start of their campaign.

Australia's camp insist Boyle can still overcome the knee injury sustained while playing for Hibernian a fortnight ago, but the Scotland-born winger - one of his adopted country's key players - was absent from training for a second day running on Tuesday evening (Wednesday morning AEDT).