The Kent wicketkeeper-batsman, who has featured in five one-day and five Twenty20 internationals for England this year, was drafted by Islamabad United from the fourth-ranked "silver" category of players.
It remains to be seen whether the 24-year-old will actually appear at the February tournament, which clashes with the limited-overs leg of England's South African tour in which Billings would expect to be involved.
If he does make the trip to Pakistan, Billings will be joined in the United dressing room by former Sussex spinner Ashar Zaidi, who was taken in the supplementary section of the draft.
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Middlesex batsman Dawid Malan was signed by Peshawar Zalmi as a silver player.
The trio followed Monday's selections of former England batsman Kevin Pietersen - who went fourth overall to the Quetta Gladiators as a platinum player, diamond selections Chris Jordan, Ravi Bopara and Luke Wright and the Karachi Kings' gold player James Vince.
Among the notable supplementary selections were Sri Lanka stalwarts Kumar Sangakkara and Tillakaratne Dilshan, long-time Pakistan spinners Saeed Ajmal and Abdul Razzaq and Australian veteran Brad Hodge.
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