The pair face the chop from the prestigious index of the leading companies listed in the UK when it comes up for renewal this week.
The quarterly reshuffle of the index could also see promotion to the FTSE 250 index for Hastings, Assura, Ibstock, Renewables Infrastructure Group and NCC Group. Losing their place could be Foxtons, Hunting, Kaz Minerals, Premier Oil and Petra Diamonds, another sign it's a tough climate for miners.
Companies face demotion from the index if their value falls below that of the 110th largest company in the rankings. If a company is in the FTSE 250 and climbs into the top 90 companies, it can enter the FTSE 100.
The companies in the frame are based on their positions as of Friday's (27 November) close. The final decision on promotion and demotion will come Wednesday (2 December) from the exchange's executive committee.