Kasabian frontman Tom Meighan is stepping down from the band after 23 years.
The singer is leaving the band "by mutual consent", Kasabian said in a statement.
"Tom has struggled with personal issues that have affected his behaviour for quite some time," was written on their official Social Media platforms.
The 39-year-old "now wants to concentrate all his energies on getting his life back on track", the Leicester band added, before concluding: "We will not be commenting further."
Meighan was a founding member of the band in 1997 alongside guitarist Serge Pizzorno.
Noel Gallagher, a hardcore fan, said on the band once: "If they do their job properly, people won't need Oasis in a few years' time."
They wbecame one of England's biggest rock bands, with five of their six albums going to number one. They headlined the Glastonbury Festival in 2014 and won best British band at the 2010 Brit Awards.
Last month, the band were supposed to play Solstice II - another homecoming gig at Leicester's Victoria Park . Un fortunately, it was postponed by the coronavirus pandemic.