By William James LONDON (Reuters) -Anyone interested in buying Chelsea Football Club can make a proposal to the government, Britain said on Friday, after ministers sanctioned owner Roman Abramovich and halted his planned sale of the Premier League side. The British government, which has been under pressure to ramp up sanctions on Russian oligarchs after Moscow’s invasion of Ukraine last month, imposed a travel ban and froze Abramovich’s assets on Thursday. The announcement brought to a halt his recently announced plans to sell the London club, which he had expected to fetch more than three bil…