The band are due to release their fourth studio album Four on August 20 in the UK.
Singer Kele Okereke suggested that difficult relations in the band could make their latest collection, which features 12 new tracks, their last.
"When we took a break in 2009 I was in the mind-set that we were done, our relationships were in such a difficult place, that this was it, this was the end, I don't know where we'll go from here," Okereke told told Triple J.
"I don't know what will happen. But I know if this is the last thing we ever do, then we've done everything I wanted to do."
Bloc Party recently unveiled new track 'Day Four'. Listen to the song below: