Jim Ryan decried Microsoft’s proposal as “inadequate on many levels.”

Tech giant Microsoft, specifically its Xbox gaming division, is currently in pursuit of a bid to fully acquire game developer and publisher Activision Blizzard. This sizable deal, if completed, would give Microsoft executive authority over Activision’s licenses, including the massively popular Call of Duty series. However, Call of Duty has been a multiplatform series for almost its entirely life, which has raised concerns with PlayStation players.

Last week, Xbox head Phil Spencer promised that Call of Duty games would remain on PlayStation consoles for at least several more years after their deal with Activision is completed. In a response to that statement, PlayStation CEO Jim Ryan has said that that promise simply isn’t good enough.

“I hadn’t intended to comment on what I understood to be a private business discussion, but I feel the need to set the record straight because Phil Spencer brought this into the public forum,” Ryan said in a statement to GamesIndustry.biz.

“Microsoft has only offered for Call of Duty to remain on PlayStation for three years after the current agreement between Activision and Sony ends. After almost 20 years of Call of Duty on PlayStation, their proposal was inadequate on many levels and failed to take account of the impact on our gamers. We want to guarantee PlayStation gamers continue to have the highest quality Call of Duty experience, and Microsoft’s proposal undermines this principle.”

Neither Microsoft nor Spencer have commented on Ryan’s stance at the time of writing.