Telecommunications giant Three has taken the decision to suspend its shirt sponsorship deal with Chelsea following the sanctions that have been issued upon Roman Abramovich.
Three has asked for “the removal of our brand from shirts and around the stadium until further notice”.
The company added: “We recognise that this decision will impact the many Chelsea fans who follow their team passionately.
“However, we feel that given the circumstances, and the government sanction that is in place, it is the right thing to do.”
Chelsea will be unable to buy or sell players, or offer new contracts, while the sanctions are imposed on Abramovich. Chelsea-owned players who are on loan at other clubs will be able to continue to play for those clubs.
The London club’s merchandise shop has also been shut.
“Once you start digging down into what this could do – yes, they can play their games but will they even be able [to]?” former Chelsea winger Pat Nevin told the BBC World Football podcast.
“Massive amounts of questions but yes, it’s not hyperbole to say the future of the club is in serious danger.”
Hyundai has also announced it is reviewing its agreement with the west London club.
“Hyundai has become one of the strongest partners in football over the years and the company supports the sport to be a force for good. We are currently assessing the situation with Chelsea,” a statement from the South Korean vehicle manufacturer read.