KISS frontman Paul Stanley says that it’s still possible that original members Ace Frehley and Peter Criss will make guest appearances during the band’s “End Of The Road” tour.

“Who knows?” he said during a recent interview with the “Torg And Eliott” morning show on 96.3 WLVQ in Columbus, Ohio (hear audio below). “I have to say that door is open, but it’s nothing that I contemplate daily. We’re 45 shows into a sold-out tour, and it’s going to continue. And it’s a celebration, not of any lineup of the band — it’s a celebration of everything we’ve accomplished with our fans. And that’s not limited to any particular people. So whatever happens, happens. But this lineup in particular — Eric‘s [Singer, drums] been playing drums for over 25 years, I think, and Tommy‘s [Thayer, guitar] been in the band for 18 years, so we have a pretty good stability and tenure of this lineup.”

Frehley recently said that while he has still not been approached to be a part of “End Of The Road”, he is not ruling out being involved in some capacity. “I’ve offered my services, and they just haven’t made the decision to bring me back,” he told Oklahoma’s KATT Rock 100.5 radio station. “And that’s okay, because I’m having a lot of fun as a solo artist. But I also am concerned about the fans as well. I wanna give the fans the biggest bang for their buck, and they’re not getting it at this juncture.

“They’ve had this lineup with Tommy and Eric for 15 years, and they announced they were doing the ‘End Of The Road’ tour, and that it was gonna be bigger and better than anything they’ve ever done in the past, and they gave the impression that maybe me and Peter might be involved, and this and that,” he continued. “Then they just come out and pretty much do the same set they’ve been doing for years. So I don’t know. It is what it is. I do my thing, and Paul and Gene [Simmons] are doing theirs.”

According to Billboard, the first North American leg of KISS‘s “End Of The Road” tour grossed $58.7 million and sold 518,395 tickets.

The trek kicked off on January 31 in Vancouver and played an additional 42 shows throughout the U.S. and Canada before wrapping up on April 13 in Birmingham, Alabama

All but five dates grossed at least $1 million and all but seven sold at least 10,000 tickets. The tour’s biggest showing was at New York’s Madison Square Garden on March 27, where KISS grossed $1.947 million and sold 13,359 tickets.

The rest of 2019 will see KISS playing 26 dates in Europe, an additional 26 in North America, and eight final shows in Australia and New Zealand.

The “End Of The Road” tour — the initial European leg of which began in Leipzig, Germany on May 27 — is expected to continue throughout 2020.