"The three players were not part of the sides that featured in Wednesday's HBL Pakistan Super League 6 double-header, and had been tested in the afternoon after showing symptoms," the PCB said.
"The HBL PSL 6 organising committee will hold a virtual meeting with the team owners and managements later on Thursday, following which a further update will be provided," it added.
Earlier, England batsman Tom Banton had claimed that he was one of the two foreign players who had tested positive for COVID-19 in the ongoing Pakistan Super League and he has been put under isolation.
PCB Director of Media Sami-ul Hasan Burney had announced on Tuesday that two foreign players and one member of the support staff had tested positive for the virus. This was after Australian leg-spinner Fawad Ahmed tested positive on Monday.
Burney had not named the two players and the support staff member.