India is a great place to play cricket and I can't wait
Niall O'Brien
And he says he cannot wait to get back out into the middle at the World Cup, which is being staged in India, Sri Lanka and Bangladesh.
"I love playing on the big stage - even at Northamptonshire when the cameras are in or when there's a full crowd," he said.
"It's been a difficult six to eight months for me but I'm fit and healthy, hitting the ball well and catching it well.
"India is a great place to play cricket and I can't wait."
Ed Joyce, who played for England at the last World Cup, is back in the Ireland team this time around and O'Brien says he is delighted to see him return to the fold.
"He's a fantastic player and a bit of a father figure in Irish cricket," said O'Brien.
"He's the favourite player, even with Eoin Morgan's emergence as a class player. He should steady the ship batting at three."
When the domestic campaign resumes, O'Brien will have to reclaim the wicketkeeping gloves from David Murphy, who took over behind the stumps at Northants during the Irishman's injury.
"He did really well and I was delighted for him," he added.
"For the good of my health, I had to get [the surgery] done. Hopefully I'll have a good six weeks in India and I'll come back, score plenty of runs and take the catches."
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