Jayaratne said the players had been kept up to speed and told to talk with the team physiotherapist before taking any medication - "even if it's a Panadol".
Perera has played three tests (averaging 33.8), and 51 ODIs. Considering Sri Lanka are starting life without their champion batsman Mahela Jayawardene and Kumar Sangakkara, the double loss is precisely what they didn't need.
"We have to regroup. It's a team in transition, so it's not an ideal situation losing two prime players who we had a lot of hopes in for the tour," Jayaratne said.
Replacement Kaushal Silva arrives in Dunedin tomorrow but talented Dinesh Chandimal will keep wicket in the first test, and is one of the players Sri Lankan captain Angelo Mathews will rely on to step up with a big contribution in the middle order. He averages an impressive 45.6 from 23 tests.
How much success their veteran left-arm spinner Rangana Herath will get from the pitches in Dunedin and Hamilton is a moot point. But he's a tidy and highly successful operator.