Warne believes England should seriously consider replacing Root with Buttler as Test captain to allow Root to focus on becoming the world's best
England's first one-day international in Sri Lanka was abandoned on Wednesday after several hours of monsoon rain in Dambulla.
"We're very aware of Sri Lanka's qualities in these conditions. They have some experienced players."
England beat India 2-1 in July to record their eighth consecutive bilateral ODI series win with just a loss in a one-off match against Scotland
ICC's anti-corruption chief Alex Marshall said Sri Lanka was the subject of corruption inquiries but the England tour itself was not under question
Only 10 players with Test-match experience make the ECB list for 2018-19, when England will be in action at a home World Cup as well as the Ashes
The decision came after Mathews accused the board of making him a scapegoat for the team's Asia Cup debacle
"I have been made the scapegoat in this entire saga of Sri Lanka's dismal performance against Bangladesh and Afghanistan in the Asia Cup."
Chandimal was already captain of the Sri Lankan Test team and will now lead the country in all three formats of the game.
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