Apple's launch of the iPhone 5S will be pushed back to August or September, a Citibank analyst said in a research note.
CNET reported that analyst Glen Yeung said that "volume production issues" likely were the cause of the delays.
Yeung's note released Sunday also said that Apple plans to roll out a version of its lightweight MacBook Air notebook computer with its "retina" high resolution display.
Apple will report earnings on Tuesday. The computer giant is expected to post an 18 percent decline in second quarter earnings to $9.53 billion, or $10.02 a share, according to the consensus of analysts surveyed by Bloomberg.
Shares of Apple were trading at $392.65 before the market opened Monday. The stock has taken a tumble since hitting a 52-week high of $705.07 on Sept. 21, 2012.