"We're having a more difficult time than we had anticipated in terms of getting support from third-party publishers, but that's our job," he said in an interview within the latest pages of PlayStation: The Official Magazine.
In its recently released Q1 2012 results, Sony's gaming division was hit with a $45 million loss, forcing its sales forecast to be "downwardly revised."
Despite big ticket franchises coming to the platform – with specifically designed versions of Assassin's Creed 3 and Call of Duty: Black Ops 2 in the works, for example – other major publishers have yet to promise any major potential blockbuster releases for the platform.
Speaking with Gamasutra, Yoshida pointed out that Sony has seen some success attracting independent developers to the platform, such as Sound Shapes dev Queasy Games and Knytt Underground developer Nifflas.
"We will continue to talk to development communities and publishing partners and tell them why Vita can provide a great experience for the IPs they have and I hope the Assassin's Creed game will prove that," Yoshida added in his interview with PTOM.