Kye Rowles invaluable as Socceroos defeat Lebanon 2-0 in World ...

Makeshift left-back Kye Rowles is shaping as a crucial part of the Socceroos' hopes of securing a spot in the final round of World Cup qualification, as Graham Arnold waits to learn the results of Jordy Bos's knee scan.

Owing to his late arrival in Australia, Arnold started Bos on the bench in Thursday night's 2-0 win over Lebanon in Sydney, with Rowles — who is a centre-back — forced to play on the left side of a back four.

But Arnold's plans were thrown into chaos when Bos came on for Riley McGree, who had a foot injury, in the first half, only to succumb to knee trouble himself.

The pair will be sent for scans, with Arnold hinting Middlesbrough midfielder McGree and Belgian-based Bos would be unavailable for Tuesday's trip to Canberra where the Socceroos play Lebanon again.

With regular left-back Aziz Behich unavailable and Bos likely sidelined, there is additional emphasis on the importance of Rowles, who netted his first senior international goal in Thursday's win.

"We're very comfortable with each other playing at the back," Rowles said.

"Whoever's in there, we know what role they're going to do and we have full belief and trust in each other.

"It's different [at left-back] going forward, but defensively it's all the same to me.

"I'm just happy to be out there and do the job needed for the team just like all the boys in the squad.

"I'm just going to give it my all no matter what and where I am.

"I'm playing on the wide left of a back three anyway at my club [Hearts] so it's not that big of a transition."

Despite not conceding a goal, Arnold felt there were unconvincing moments from the Socceroos that would have been punished by superior opposition.

"There was a bit of sloppiness and the pitch wasn't easy to play on," Arnold said.

"We have to be better than that and towards the back of the game we gave Lebanon a bit more confidence.

"We've got to rebuild and I said that before the Asian Cup but the most important thing is we got the three points and we move forward."

AAP