An index of the world’s richest people has claimed that Arsenal’s second largest shareholder, Alisher Usmanov, has been among the hardest hit by this week’s collapse of the rouble, with the Uzbek-born businessman losing $809m (£517m) in the last 48 hours, while Chelsea’s Roman Abramovich lost nearly $450m.

The Russian currency has fallen to its lowest value in more than a decade as a result of falling oil prices. That has led to major losses among some of the country’s oligarchs, with a total of $10bn wiped off their collective fortunes since Monday night.

According to Bloomberg’s Billionaires index, Usmanov – who owns 30% of Arsenal’s shares – suffered the most losses, $809m, to leave his personal fortune at an estimated $13.4bn. The Chelsea owner, Abramovich, came in third on the list and is now worth an estimated $12.8bn.