Bill Ward has said he could only work with Black Sabbath again if he receives an apology from Ozzy Osbourne.

Ward did not play on Black Sabbath’s 2013 studio album, 13. It was additionally claimed that the band could not come to a financial agreement with Ward.

In a long statement published on his website, Ward – who is soon to release a new album, Accountable Beasts, with his own outfit BWB – said only a personal apology from Osbourne could tempt him back into the fold. “Righting of wrong works, and that’s what I want if I’m ever going to be his friend again,” he wrote.

He also told fans he has “been in deep regret since January 2012 that a true union was denied.”

Ward set his demands out clearly in the statement, writing: “I must admit, I have little to no expectations of this happening, but in the order of first things first, I’m looking for an honest accountability of all of Ozzy’s statements that I felt were untrue. I would want Ozzy to amend his opinions and exaggerations. I would want him to be forthcoming about his unrealistic viewpoints. And because I was chastised publicly, I would want him to amend publicly in his words, and not through an Ozzy representative, the nature of the wrongs. I would not want to continue on with him without this seemingly impassible dilemma being addressed.”

Ward also stipulated he would need “a “signable” contract” before he could consider playing with the band again.

He continued: “I’ve listened to nothing but insults and false remarks, and if as a band or as individuals they wish to continue along the same lines, then any notion of an original Black Sabbath lineup will continue to fade away.”

“Put simply, it’s up to them. I have dearly missed playing with them and as people, I have been heartbroken over the loss of who I thought we were. And now you know where I stand.”

Black Sabbath have yet to repond.