"If not then we'll make trouble," Tekin Nasikkol, who heads the works council of Thyssenkrupp's steel unit, told reporters on Wednesday.
"There is a lot to talk about, but we don't have anyone to talk to," Nasikkol said. "I have to strongly condemn this."
Nasikkol said the decision on the entity's leadership should have been made months ago.
The joint venture, to be called Thyssenkrupp Tata Steel, will have a two-tier leadership structure: a management board and a supervisory board, each with six members, on which both companies will be equally represented.
(Reporting by Tom Kaeckenhoff; Writing by Christoph Steitz; Editing by Riham Alkousaa and Elaine Hardcastle)
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