The voice of rugby league, Ray Warren, has been given until Sunday morning to make a decision on whether he will call the NRL grand final after suffering an infection.

The veteran Nine Network commentator has been on antibiotics this week for a prostate infection, but is hopeful of being in the box for St George Illawarra's showdown with the Sydney Roosters.

The 67-year-old, who hasn't missed a grand final broadcast since 1991, is hopeful of calling his 41st title decider.

"I'm OK, I've just come down with a major infection of the prostate," Warren told the Austereo radio network from his hospital bed on Friday morning.

"They had to get antibiotics into me but they needed to put me in hospital to put me on a drip to get them in there quickly.

"I'm only in hospital because they wanted me on a drip to get me back on my feet before the grand final.

"Whether I'm going to make it or not I don't know ... I think I am, I feel pretty good this morning."

Warren said Nine executives had given him time to make a decision, with back-up commentator Andrew Voss the obvious replacement if he doesn't make it.

"They said I could wait until as late as Sunday morning, they didn't want me to rush any decision," Warren said.

"The doctors are saying give us as long as you can, they think the drug's going to start working from today.

"That's given me a couple of days more.

"I was more intent on making a decision today in courtesy to Andrew and the other people that are going to be affected by it."

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