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The music producer claimed that Allen won't return his calls and suggested that they may not be friends anymore.
Ronson told The Sun: "Lily has been working on her new album, but I’m probably not going to be on it as she hasn’t been returning any of my calls.
"Most of the people I work with, I’m lucky enough to be friends with too. But then you never really know what’s going to happen after."
Ronson helped to produce Allen's debut album Alright, Still and collaborated with the singer on a cover of the Kaiser Chiefs single 'Oh My God'.
Allen did not appear at Ronson's Electric Proms gig to perform the collaboration but Ronson denies that her no-show has caused a rift.
He added: "She didn’t come but she had another commitment and she explained why and it’s fine.
"I’m not going to lie and say I wasn’t disappointed - but it’s not like she just didn’t show up or something."
