Brendon McCullum is set to miss the first two matches of New Zealand's Twenty20 series against Pakistan due to a back problem.
McCullum reported stiffness during a fitness test on Christmas Eve and is likely to sit out the fixtures on Boxing Day and December 28.
New Zealand selector Glenn Turner explained McCullum had shown 'great determination and a great willingness' to push through discomfort on the recent tour of India because he was committed to being a wicketkeeper-batsman in limited-overs cricket but the panel were taking a longer-term view and were not prepared to risk further setbacks.
"The medical staff are confident that intensive treatment and the right rehabilitation will stabilise his injury and get him back to full fitness," Turner said.
McCullum will have another fitness test ahead of the third Twenty20 match on December 30.
He could play in that game as a batsman but only if the test shows playing would not have a detrimental effect on his overall recovery and his ability to keep wicket in the ODI series.
Turner said McCullum was expected to be available for the first Test starting on January 7 in Hamilton and would be having a programme of work aimed at strengthening his back.