Intel Corp. Chief Executive Officer Lip-Bu Tan gave investors a stark diagnosis of the chipmaker’s problems on Thursday, along with the sense that it will take a while to fix them.

Intel's shares fell more than 8% on Friday as the company's weak revenue and profit forecasts overshadowed new CEO Lip-Bu Tan's strategy to revitalise the embattled chipmaker.

Intel shares dropped almost 4% in heavy trading in Frankfurt on Friday after issuing downbeat forecasts for both revenue and profit the day before, as investors fretted about the outlook for the chip sector against the backdrop of the U.