SIENA, Italy (Reuters) - The chairman and the chief executive of Italy's Monte dei Paschi di Siena will remain in their jobs despite being forced to delay a capital increase by the bank's top investor, a source with direct knowledge of the matter said on Tuesday. "Yes," the source said when asked if Chairman Alessandro Profumo and CEO Fabrizio Viola would stay on after a board meeting discussed their fate on Tuesday. The two had threatened to resign last month after a shareholder meeting voted down their proposal to launch the 3-billion euro ($4.11 billion) rights issue in January. The cash call has been postponed until mid-May at the earliest. (Reporting by Silvia Ognibene, writing by Silvia Aloisi; editing by Agnieszka Flak)