Sony chief executive Kaz Hirai has suggested that PlayStation's latest handheld, Vita, has sold on the "low end of what we expected".
The PlayStation business has chosen not to reveal specific global sales of its latest portable, having recently merged it with the older PSP to help circumvent a mandatory disclosure to investors.
But Hirai - formerly the group CEO of PlayStation - indicated that Sony would support the device in the foreseeable future.
"Long-term is what is important," he said, as quoted by the Wall Street Journal.
Hirai's comments were made during his visit to the Consumer Electronics Show in Las Vegas - an event which put the handheld business on the agenda earlier this week when chipmaker Nvidia revealed its new Project Shield portable device.
Hirai's view of the newly announced handheld's commercial chances appeared to be negative.
"It's difficult to break into [the handheld segment]," he said. "I've managed this industry, so I know."
During an on-stage presentation at CES, Hirai said that consumers "are used to playing video games on not just consoles anymore, but a variety of devices".
On another stage at CES, Sony revealed its new Xperia Z smartphone, which integrates PlayStation Mobile functionality.
[FURTHER READING: A second look at PS Vita]