Short sellers have placed their biggest bets in more than a decade against Kering , according to data reviewed by Reuters, intensifying pressure on incoming CEO Luca de Meo to restore confidence in the French luxury group's financial outlook.

In June, François-Henri Pinault decided to step aside, enabling the company to bring in former Renault chief executive de Meo. The move boosted Kering’s shares by 33%.

De Meo officially assumes his role on Tuesday, when he is expected to outline his vision for Kering. The group has reported double-digit sales declines at Gucci , its largest label, and Saint Laurent , its second-largest. It also faces scrutiny for its high levels of debt in an otherwise cash-rich luxury sector.

Investors welcomed de Meo's track record in restructuring, wit

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