The issue with SL bowling is all bowlers is of similar pace. Chameera clearly lacks fitness for test cricket, as he couldn't string a 140k+ over on the trot. Replacements are as worse as they come. Nuwan Pradeep is one of the best in seaming conditions but cannot last five days. Asitha Fernando is pacy, but not pacy enough with that short stature to make a challenge. Best may be to go with an additional spinner, who will at least keep things tight. Chandimal was poor, so he can be rested, and Shanaka can come in.
Thirimanne, Karunarathne, BOP, Nissanka, DDS, Dikwella, Shanaka, Hasaranga, T Bag, V. Fernando, Embuldeniya would be my 11.