Colombo: Ireland's tour of Sri Lanka in April will see the countries facing each other in two Test matches as opposed to one Test and two one-day games.
Cricket Ireland agreed to the fixture format change following a request from Sri Lanka.
The Irish will have six white-ball games in Bangladesh before travelling to Sri Lanka.
Cricket Ireland's high performance director Richard Holdsworth backed the change of format.
Ireland's squad for the Sri Lanka Tests shows a number of changes from the originally announced travelling party.
With seamer Barry McCarthy and Matthew Foster ruled out by injury, pacemen Mark Adair, Fionn Hand and uncapped Tom Mayes have been called up.
South Africa-born Mayes, 21, was last weekend drafted into the Bangladesh leg of Ireland's trip to Asia as a replacement for McCarthy, who has a knee injury.
Paul Stirling and Josh Little are missing the Tests in Bangladesh and Sri Lanka as they juggle their international and franchise cricket commitments although opener Stirling will be available for the six white-ball games in Bangladesh.
Ireland Test squad v Sri Lanka:
Andy Balbirnie (Captain), Andy McBrine, Mark Adair, Curtis Campher, Murray Commins, George Dockrell, Fionn Hand, Graham Hume, Matthew Humphreys, James McCollum, Paul Stirling, Harry Tector, Lorcan Tucker (Wicket Keeper), Ben White, Peter Moor, Thomas Mayes