By Tom Sims and John O’Donnell

FRANKFURT (Reuters) -In 2013, Deutsche Bank handed Christian Sewing, a rising star, the sensitive assignment of investigating derivatives trades under scrutiny in Italy.

More than a decade later, Sewing, now CEO, faces criticism in a lawsuit by a former Deutsche employee over his handling of the task. The suit has prompted Deutsche to review how the bank and Sewing, chief auditor at the time, managed the situation, according to a person with knowledge of the matter.

Dario Schiraldi, a former banker at Deutsche who was involved in the trades, claims in a 152-million-euro ($178 million) lawsuit seeking damages from the bank that the lender’s actions, including the audit overseen by Sewing more than a decade ago, harmed Schiraldi’s reputation and earnings, ac

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