The Sri Lanka players were initially worried about the long period of time they will have to stay in the country which led to the Test series being swapped with the ODI and T20I series. As per the original programme, Pakistan was scheduled to host Sri Lanka for two-match Test series in October before Sri Lanka returned for three ODIs and three T20Is in late December.
During the aforementioned meeting, the Chairman of the Sri Lanka Selection Panel Asantha De Mel gave players the freedom to decide on either taking part or not in the forthcoming Pakistan tour.
One reason why SLC is willing to send its second-string side to Pakistan right now, is because the series holds no relevance in the larger context. However, that is not the case with the Test series, as it is part of the International Cricket Council (ICC) World Test Championship. If SLC send their second-string side for the Test series or withdraw from it altogether, they run the risk of losing out on important points in the championship