The 27-year-old was recently found dead at her home in London but the US rapper and The Voice judge said they had plans to collaborate on a new track.
Green said to E! Online: 'We were discussing working together. We have a mutual friend, [producer] Salaam Remi.
'There was a rumour that we had already recorded together. It wasn't true and I don't know where that came from. But we did grow fond of each other and thought we could work together.'
He added: 'I could listen to her and she registered to me as the real thing... it's so untimely and unfortunate. What a loss. Music has lost a daughter.'