Shares in Lloyds Banking Group's fell almost 4% after the company said chief executive Antonio Horta-Osorio is to take medical leave.
In a statement, Lloyds said Mr Horta-Osorio is expected to return to his position before the end of the year.
He became chief executive in March and has been rebuilding the bank after its near-collapse in the financial crisis.
finance director Tim Tookey was appointed as an interim replacement.
