ATHENS (Reuters) - Greece's finance minister will hold talks with top Greek bankers later on Sunday, a finance ministry official told Reuters, after opinion polls showed Greeks were on course to reject a bailout proposal from creditors. Greek banks have been shut for a week after Athens imposed capital controls to prevent the lenders from collapsing. A 'No' vote is expected to further add pressure on the banks, which government officials have said will not reopen until a deal is reached with creditors. (Reporting by Lefteris Papadimas)