BlackRock's (BLK) senior executive Mark Wiedman is leaving, disrupting plans at the asset manager since he was touted as one of the potential successors to CEO Larry Fink, according to media reports Tuesday.

Wiedman, who led the global client business and had been with the firm for 20 years, has decided to explore opportunities outside BlackRock, and the company is expected to promote several executives as early as this week, Bloomberg reported, citing people familiar with the situation.

His departure is expected to be announced soon, and he will forfeit $8 million in stock options, the Financial Times reported, citing sources.

The company declined MT Newswires' request for comment.

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