The trio has been called up should the need arise for them to replace players in their main squad. Tim McCaskill, head of Sri Lanka Cricket's high-performance center, will also travel to Australia with the players.
Seamer Pramod Madushan also suffered an injury and hasn't played since the match against UAE although he hasn't been officially ruled out yet.
In the batting department, they suffered a blow in the form of a hamstring injury to Danushka Gunathilaka during the group stage. Ashen Bandara was called up as Gunathilaka's replacement, and he had to step in and play in Sri Lanka's first Super 12 match against Ireland in place of Pathum Nissanka, who was rested due to groin injury.
Sri Lanka have so far beaten Ireland and lost to Australia in the Super 12 stage. Their next match is against New Zealand on Saturday at the SCG.