[10] In October 2018, he was named in the squad for the Comilla Victorians team, following the draft for the 2018–19 Bangladesh Premier League.

[14] In November 2021, he was selected to play for the Kandy Warriors following the players' draft for the 2021 Lanka Premier League.

[23] Gunaratne scored his maiden ODI century on 11 February 2017 against South Africa at Centurion.

[26] On 17 February 2017, against Australia, Gunaratne scored his maiden T20I fifty off 37 balls, helping the team to win the match by 5 wickets.

[27][28] In the next T20I game he scored an unbeaten 84 runs off 46 balls to guide Sri Lanka to the series victory.

Gunaratne set the record for the highest T20I score batting at number five or lower for Sri Lanka, with 84 not out.

[32][33] In one-off Test against Zimbabwe in July 2017, Gunaratne scored a match-winning unbeaten 80 to seal the match in a record chase.

With that, he was taken to the hospital, where doctors advised him to quit playing for six to eight weeks following reconstructive surgery in Colombo.