Tata Steel UK CEO Bimlendra Jha, has resigned from the post, a source said.
The source, however, did not divulge information about the reason for resignation.
An email query sent to Tata Steel seeking comment over the resignation remained unanswered.
Tata Steel is in the process of merging its European operations with German steel major Thyssenkrupp AG to create a 50-50 joint venture.
The proposed new company, to be named ThyssenKrupp Tata Steel BV, headquartered in Amsterdam area, will be positioned as a leading pan-European high-quality flat steel producer with a strong focus on performance, quality and technology leadership.
In October 2018, the European Union launched an "in-depth investigation" to assess if Tata Steel's proposed joint venture with German steel giant ThyssenKrupp would breach the bloc's merger regulations and reduce competition.