East Renfrewshire MP Jim Murphy said the vote should be held only when the future of the crisis-hit eurozone becomes clear.
But his comments will increase speculation that Labour leader Ed Miliband is toying with backing calls for a public vote.
A senior Labour frontbencher and former Europe minister has suggested the UK hold a referendum on leaving the EU.
East Renfrewshire MP Jim Murphy said the vote should be held only when the future of the crisis-hit eurozone becomes clear.
But his comments will increase speculation that Labour leader Ed Miliband is toying with backing calls for a public vote.
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