"We want to do it. It's sounding great and we want to get and get out there," he told the British radio program in an interview broadcast Monday. "It's got to be right. There's no point in just finding another Robert."
Led Zeppelin's spokesman Chris Goodman declined to comment Wednesday on plans for a possible reunion.
Plant joined the rest of the band for a one-time concert in London's cavernous O2 arena last December. It was the group's first full set since 1980, the year the band broke up after drummer John Bonham died.
The O2 concert generated rave reviews and calls for the band to reunite.
Plant recently toured with bluegrass artist Alison Krauss. However, Plant said in a statement on his Web site that he has no intention of touring with anyone for at least the next two years.
The band's former promoter Harvey Goldsmith said the band should not tour without Plant.
"If they're going out with another singer it's not exactly Led Zeppelin," he said, "and if it is, then them doing a long tour, I'm not sure what the point is because they don't need to do it."