Giving full confidence to the embattled Windies offspinner, who had pulled out of their triumphant World Twenty20 campaign, Gambhir said: "I feel that he will be far more confident this year than last year.
"He has worked on his action, he's got the monkey off his back. He can go into the game with freedom knowing that everything is sorted. He was always under scrutiny. I think you will see the best of him this year around."
He was suspended in November, after being reported during an ODI in Sri Lanka, and his last appearance came at the Bangladesh Premier League.
The ICC said that Narine's retest took place on March 28 in Chennai. He is now free once again to play in international and domestic competitions.
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Narine who has gone back home after his father's demise would be available from the second match against Mumbai Indians April 13, Gambhir said while adding that another West Indian Andre Russell would be available for tomorrow's match against Delhi Daredevils.
Delhi Daredevils are boasting of WT20 star player Carlos Brathwaite, who became the toast of the cricketing world after blasting four successive sixes in last over against England, but Gambhir said their focus was on the entire team.
"We don't discuss about individuals. It's not only about Brathwaite but other quality players as well. We have to beat a team of XI individuals to win a game of cricket."
It's been about two years when he last played for India but the left-handed batsman said he's not worried about selection and was totally focused on winning a record third IPL silverware for KKR.
On former coach Trevor Bayliss, Gambhir said it's the team that made him successful.
"A successful team makes a successful coach. He's only successful because the people in the dressing room has made him successful. It's the team that made him successful coach.