The Socceroos have lost the final link to Australia's "golden generation" with captain Mark Milligan announcing his international retirement.

One of just two Australians to make four World Cup squads along with Tim Cahill, the 34-year-old told teammates and staff on Monday he was calling time on his Socceroos career.

Milligan debuted for Australia in a friendly against Liechtenstein in June 2006 and went on to make 80 appearances for his country.

A member of Australia's 2006, 2010, 2014 and 2018...

Socceroos skipper Mark Milligan has joined English third-tier outfit Southend United.

The 33-year-old midfielder left Scottish Premiership club side Hibernian in May and has been recruited by the League One club on an initial one-year deal, plus an option for a further year.

"I'm very excited. It's always a process but to be down here now I can't wait to get started," said Milligan, capped 79 times by Australia and who featured at the 2014 and 2018 World Cups.

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United States youth international Charlie Kelman scored from inside his own half on his professional debut in England.

Playing for Southend in the third-tier League One, Kelman lobbed the Plymouth goalkeeper in the second minute of stoppage time. But it wasn't enough to prevent Southend losing 3-2 on Saturday.

David Beckham? Wayne Rooney? No, this comes from @SkyBetLeagueOne!

17-year-old @CharlieKelman0 scores from the halfway line for @SUFCRootsHall 😱#EFLonQuest at 9pm... @SUFC_fans @SUFC_History pic.twitter.com/L4STovYWSa

— Quest (@QuestTV) January 12, 2019

Manager Chris Powell says Kelman "was a real livewire for us and obviously he's scored a wonderful goal."

It evoked memories of David Beckham's strike for Manchester United from the halfway...