Gautam Gambhir, 42, replaces Rahul Dravid as head coach
Gambhir's first assignment: 3 ODIs and 3 T20Is in Sri Lanka from July 27
Under Dravid, India won the 2024 T20 World Cup and reached ICC finals
Gambhir played in 58 Tests, 147 ODIs, and 37 T20Is for India
Gambhir mentored Kolkata Knight Riders to win the IPL this year