Malik appeared before an inquiry committee on Saturday after he admitted to throwing the match on Thursday night.
"The Pakistan Cricket Board (PCB) chairman Shaharyar Khan took a strong notice of the incident and a disciplinary action would be taken in consensus with the serious implication of the offence," said a PCB release.
A final decision would be announced on Monday, it said.
The 23-year-old, leading his hometown Sialkot team, admitted throwing the match against the Karachi Zebras as a protest after his team was penalised for a slow-over rate in another match, against Lahore in the same event.
Malik was initially fined 10,000 rupees (around $170) by match referee Rizwan Khatib for admitting the offense in television comments, and was asked to appear before an inquiry committee.
Under the rules, Malik could also face the full match fee of an international match as a fine.
The three-member committee - comprising former Test players Haroon Rasheed and Shafiq Ahmed, and PCB legal adviser Asghar Haider - showed Malik his television comments in which he confessed to the offence.
Malik, who has so far played eight Tests and 99 One-day Internationals for Pakistan, said he has spoken the truth before the committee.
"I have given my view point. I have spoken the truth before the committee and now the decision is up to the PCB," Malik said after the hearing.
PCB chairman Khan has termed the incident as "sending wrong impressions about Pakistan cricket."
Pakistan cricket has been tainted by allegations of match-fixing in the past with former captain Salim Malik banned for life and several others fined after an inquiry, including current skipper Inzamam-ul-Haq and now-retired Wasim Akram and Waqar Younis.
Sialkot were chasing 176 to win and needed only 20 off the last three overs, but ended at 171 for three, losing by four runs.
Malik's decision helped Karachi Zebras to earn a place in the triangular stage of the event but the PCB declared the result of the match null and void, eliminating both teams from the second stage.
Pakistan launched the first ever Twenty20 Cup, in which each team plays a 20 over innings, after similar events were a big success in England, Australia and South Africa.