The rugby league Immortal has drawn parallels with the coronavirus hit season and the Knights' famous ARL title triumph, saying both will have a question mark over them.

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With the NRL working towards a May 28 return, Johns liked the idea of a reduced 15-round regular season before finals are played to determine the 2020 champion.

But he questioned how history would view the pandemic-interrupted season.

"I think it's a fair indication (of genuine premiers). Two rounds (already played) then 13 rounds, everyone plays each other once," he told Wide World of Sports. "The cream will always get to the top. And then the semi-final series, we're going to see the best of the best. Unfortunately, there will always be that asterisk against the team that wins the competition."

Johns predicted this year's title winners would have to live with the same feeling he endured after Newcastle's fairytale premiership 23 years ago.

Knights flyer Darren Albert's last-gasp try that sealed a comeback 22-16 win over Manly in the 1997 ARL grand final is part of rugby league folklore.

But Johns revealed he would always wonder what might have been despite his heroics to create Albert's match winner.

In 1997 the game in Australia was ripped in two with Newcastle emerging triumphant in the 12-team ARL competition and Brisbane dominating the 10-strong rebel Super League.

"I know back when we were playing some rep footy after '97, a lot of people would say, 'ah yeah, it's only half a comp. You didn't beat the Broncos'," Johns said. "Which, they're right. I don't know whether we would have beat the Broncos in that era. They were red-hot, 22 internationals at a club. So there's always that thing (but) over time I've heard it less."

Meanwhile, the federal sports minister has labelled the NRL's planned resumption a "bit ambitious" and urged caution for all codes.

The NRL this week will forge ahead with their plans for a May 28 return, with meetings set with both major broadcasters on Tuesday.

Australia's Chief Medical Officer Brendan Murphy warned on Sunday he thought it was "premature" to be planning a comeback amid the coronavirus.

And Sports Minister Richard Colbeck on Monday told ABC Radio that while he wanted to see leagues return soon it had to be within reason.

"I think it's a bit ambitious to be frank," Colbeck said. "I think we need to be really cautious about the circumstances we are in. Yes, we are doing extremely well at the moment. But once the health authorities that are giving us advice give us the signal, we can start to relax some of those things."

Colbeck's comments come after Queensland Premier Annastacia Palaszczuk said that border restrictions would not be eased for NRL clubs.