For asset managers such as Robeco, Lara Yacob explained that the materiality of biodiversity must focus on its role in maintaining shareholder value.

FORBES: Making biodiversity material for investors

Having not been paid, Bianco and Villagran decided to take a more gung-ho approach to secure payment for their alleged involvement in Yacob's move to West Brom.

CNN: SHARE THIS

Villagran and Bianco have also been unable to provide CNN with any written contract that sets forth a relationship with Yacob in relation to the transfer to support their claim for compensation.

CNN: SHARE THIS