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Two-thirds of the jobs at Commerzbank could disappear if UniCredit successfully carries out a hostile takeover of the German lender, a Commerzbank supervisory board member warned on Tuesday.

Stefan Wittmann, who is also a senior official at German trade union Verdi, told CNBC's Annette Weisbach that "we certainly hope we can avoid" a hostile takeover by the Italian bank. Witmann said Commerzbank's board had called on the German government to carry out an internal review of the possible takeover, which he hopes will give the bank a six-month period to take stock of the situation.

"But if it [a hostile takeover] is unavoidable, we think that two-thirds of jobs will disappear, that there will be another significant cut in the branches," he said, according to a translation.

"We will see in particular that UniCredit does not want all Commerzbank customers at all, but that it focuses on the supposedly best customers, namely the wealthy customers," he added.

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