The BBC has seen evidence that top executives at Shell knew money paid to the Nigerian government for OPL 245, a vast oil field, would be passed to a convicted money-launderer, Dan Etete.
The deal was concluded while Shell was operating under a probation order for a separate corruption case in Nigeria.
Shell said it did not believe its employees acted illegally.
The BBC is awaiting comment from Etete, who has previously denied any wrongdoing.
Former Shell chief executive Peter Voser was alleged to have received an email showing Etete’s involvement in the deal. Voser’s representatives declined to comment.
This article has been summarised, the full original article can be found at bbc.com