Osman Samiuddin talks about the latest spot-fixing scandal in the Pakistan Super League and explains why these leagues are targeted (3:41)

Mohammad Irfan, Zulfiqar Babar and Shahzaib Hasan have been questioned by the PCB's anti-corruption unit as part of the ongoing investigation into alleged attempts to corrupt the Pakistan Super League. Unlike Sharjeel Khan and Khalid Latif, however, these players have not been provisionally suspended and are free to continue playing the tournament.

PSL chairman Najam Sethi revealed the three new names on his Twitter handle, while stressing the league would continue to remain vigilant against the "menace of corruption".

In his tweet about Irfan, Sethi said: "Inquiry will continue. He does not face any immediate suspension." About Zulfiqar and Shahzaib, Sethi said: "They will continue to play."

Sethi later tried to draw a line under the issue, adding on Twitter: "No more player suspensions are envisaged during PSL PROVIDED there is no NEW cause for action. Failure to promptly report any attempt to corrupt and subvert PSL will be cause for action."

Like Sharjeel and Latif, fast bowler Irfan, 34, also plays for the defending champions Islamabad United in the PSL, while left-arm spinner Zulfiqar, 38, represents Quetta Gladiators and Shahzaib, 27, plays for Karachi Kings.

Shahzaib's questioning, according to his team Karachi Kings, was the result of his reporting an approach to the PCB.

Sethi had informed Karachi Kings and Peshawar Zalmi of the developments concerning Sharjeel and Latif before their game on Friday. At that point the Kings owner, Salman Iqbal, sought permission from the organisers to address his team.

"I took permission from PCB to allow me to brief my players and I reminded them to be aware about these things," Iqbal told ESPNcricinfo. "I insisted to all my players to report anything you feel odd around you or if anyone approaches you for wrongdoing. Then later I came to know that Shahzaib had reported an approach to the PCB and he was investigated about everything he knows. He has been cleared and will play the tournament."

It is understood that after Zulfiqar's name came up in speculation surrounding the developments, Quetta Gladiators volunteered him for questioning in a bid to clear his name.

Irfan, Zulfiqar and Shahzaib are all experienced domestic cricketers and have represented Pakistan. Irfan has played four Tests, 60 ODIs and 20 T20Is for his country, Zulfiqar 15 Tests, five ODIs and seven T20Is, while Shahzaib has played three ODIs and ten T20Is.

The news of alleged attempts to corrupt the PSL broke on Friday, when the PCB announced that it had provisionally suspended Sharjeel and Latif and asked them to return home.