The Pakistan Cricket Board has informed the game's governing body (ICC) that they suspect bookmakers are staying on the same floor as the Pakistan players in the team hotel in Colombo.
Salim Altaf, the PCB's chief operating officer, said the Anti-Corruption and Security Unit of the ICC has a representative in Sri Lanka who is looking into it.
"He will obviously report back to the ICC and I see this taking some time. We will wait for his report," he said.
Pakistan lost their three-match Test series 2-0 and have lost the first three games of their five-match, one-day series.
The side's poor performance in Sri Lanka has come as a shock in Pakistan, which only recently celebrated the team's triumph in the Twenty20 World Cup in England.
ICC spokesman Brian Murgatrord confirmed that the body is aware of the issue at the hotel.
"We can confirm the ICC's Anti-Corruption and Security Unit is aware of the matter and will deal with it as appropriate."
