New Zealand's Milne suffered a hamstring injury in CSK's first match against Kolkata Knight Riders on March 26, which was also the season opener, weeks after which he has been ruled out of the tournament. Pathirana, a young 19-year old medium pacer, was a part of Sri Lanka's U19 World Cup squads in 2020 and 2022.

from Times of India https://timesofindia.indiatimes.com/sports/cricket/ipl/top-stories/ipl-2022-sri-lankan-matheesha-pathirana-replaces-adam-milne-in-csk-squad/articleshow/90977724.cms