Mumford And Sons already have ideas for the band's third album.
Their second, Babel, released last September, returned to number one this week thanks to a post-Glastonbury sales boost.
The band are planning to take the rest of the year off after September, then think about starting the new album next year.
Keyboard player Ben Lovett said: "We have to challenge ourselves musically, that's crucial.
"We made the mistake with Babel of thinking we were ready to release it when we weren't, so I'm hesitant to announce too much, but we've already got some ideas.
"More than anything, we're incredibly excited about the next chapter and what the third album can be. Sigh No More and Babel are really part one and two of a similar story. The third album can be anything we want it to be."
:: Mumford And Sons hold their Gentlemen Of The Road stopovers on July 19 and 20 on The Convent Field in Lewes, East Sussex. For more information visit www.gentlemenoftheroad.com.