The Red Hot Chili Peppers apologised to fans after cancelling its sold-out concert due to frontman Anthony Kiedis’ condition.

In a message posted on its website, the group said, “Due to Anthony Kiedis’ hospitalisation from complications from the intestinal flu on Saturday evening, the Red Hot Chili Peppers regretfully must postpone their upcoming concert for iHeart Radio on May 17th.”

It added, “They would like to extend their gratitude to the fans for the outpouring of well wishes. Anthony is expected to make a full recovery soon.”

Nevertheless, it appears as if its two-day concert in Budapest, Hungary on Sept. 1 will still push through. This will be followed by a string of performances from the Red Hot Chili Peppers in Prague, Oslo, Stockholm, Helsinki, Zurich, Bologna, and Turin in Italy plus Montpellier and Paris in France on Oct. 16.

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According to E! News, Anthony Keidis was rushed to the hospital on Saturday due to his condition which forced the Red Hot Chili Peppers to scratch out two performances in California. The band also had to cancel a performance in Irvine Meadows Amphitheatre for the KROQ Weenie Roast.

A clip of the band’s bassist Flea appealing for understanding from the disappointed crowd was posted on Instagram by user Kristyn 5527.

Get well soon Anthony!!! Hey @chilipeppers if you play the music, we'll sing!! #weenieroast #kroq #sadday #getwellsoon #rhcp #redhotchilipeppers 😢 ❤️❤️

A video posted by Kristyn (@kristyn5527) on

“Anthony is on his way to the hospital right now and we’re unable to play this evening,” Flea told the crowd. “We are devastated about it. We’re really sad. We love you so much.”

Australian-born Flea also added, “We live to rock, we live to f–king dig deep into the depths of our hearts and rock. But unfortunately there’s a medical thing that happened and he needed to deal with it.”

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Drummer Chad Smith, meanwhile, tweeted on May 14, “NO one’s more disappointed than us that we couldn’t perform tonight. Sending love and a speedy recovery to my brother Anthony.”

To date, there’s no update yet on Anthony Kiedis’ condition and when he’s going to be released. The Red Hot Chili Peppers’ website is also silent on whether it will hold another concert for iHeart Radio or just refund the tickets.