The duo, who are nominated for four awards at the event tomorrow night (19.02.14), are set to perform with the New Zealand singer but have struggled to organise their set for the show at London's O2 Arena.
Band member Howard Lawrence told the Daily Star newspaper: ''It's been tough getting things ready as we've been on the road.
''So we've been constantly on the phone with Lorde, organising stuff. It was somebody else's idea to hook up so we haven't even met her yet.
''We've only been able to communicate remotely or through Skype because we've been so far away.
''We get a few hours' rehearsal before the performance so hopefully it will come together.''
Brothers Guy and Howard were given a preview of the 17-year-old singer's talent when she sang her hit song 'Royals' live at the Grammy Awards last month.
Howard, 19, said: ''She was amazing at the Grammys. That gave us an idea what to expect at the BRITs.
''It was a great night. We went to Daft Punk's party afterwards - they had their masks on - and met Pharrell [Williams], which was cool,'' he added: ''Awards are a mass of chaos and fun.''
Lorde is nominated for International Female Solo Artist at the BRITs, while Disclosure are up for British Group, British Breakthrough Act, British Single for their hit 'White Noise' with Aluna George and Mastercard British Album of the Year for their record 'Settle'.
The brothers feel their success is down to the popularity of dance music in Britain at the moment.
Howard added: ''It is a special time for British music.
''When we're in the US all we get is: 'Why is the UK doing so much good dance music?'
''I kind of agree. The UK is leading the world in all types of music.''