Ex-Manchester United shotstopper Bosnich, who spectacularly fell from grace after battling a cocaine habit, is in the process of reviving his career through a short-term deal with the Central Coast Mariners, who face the Roar at Suncorp Stadium on Sunday.

And Farina, who frequently deployed the now 36-year-old Bosnich during his tenure as Socceroos coach, said there was no reason the high-profile 'keeper couldn't battle his way back into Australian calculations.

"Never say never. Everything's possible," Farina said.

If Socceroo selection proves well beyond Bosnich, Farina said the former Chelsea star could at the very least become one of the best custodians in the domestic competition.

Bosnich is filling in for suspended Mariners first-choice 'keeper Danny Vukovic but has been linked to new A-League franchise Gold Coast United, which along with North Queensland FC will be confirmed as starters in an expanded competition next season.

He might not have age on his side but Farina compared his longevity to that of Italian great Dino Zoff, who won the 1982 World Cup with the Azzurri.

"He's still got it. Goalkeepers are a different breed to outfield players. We saw Dino Zoff win a World Cup at 40. Mark needs time to get back into the rhythm and routine of football but he's still got it," Farina said.

"I think once he's back in top condition and form there's no reason why he couldn't be regarded as one of the best in the league. He certainly commands the backline and organises the defence."

However, Farina's well-wishing to Bosnich doesn't extend to the contest on Sunday. "I'll be happy if he slips a couple through," he added.

The Roar will be hoping Bosnich's first league start in Central Coast colours draws plenty of extra fans to Suncorp after just over 12,000 filed through the gates at the tail end of a frantic weekend of Brisbane sport.

They watched the Roar play out their second draw in as many games, ending the afternoon locked at 1-1 with Adelaide despite outclassing the Reds for the bulk of the contest.

Farina called for a more ruthless approach from his team, which has embraced an attacking style partly thanks to the recruitment of skilful Scot Charlie Miller and powerful Dutch striker Sergio van Dijk.

"We've got to finish teams off. We're unlucky we're not sitting on six points. At the end of the day, we're playing good football. Particularly the way we played against Adelaide, we've got to go for the jugular," Farina said.

The Roar are sweating on the fitness of veteran Danny Tiatto, who is in doubt with a corked calf, but Craig Moore (knee) and newly re-signed midfielder Massimo Murdocca (ribs) are on track to meet last year's premiers.