MOSCOW, July 8 (Reuters) - The Russian rouble weakened slightly against the dollar on Monday, continuing its downward trend under pressure from reduced foreign currency inflows at the start of the month, after surprise strengthening at the end of last week.

The rouble has weakened steadily since late June, coinciding with reduced foreign currency supply from exporters who usually convert FX revenues into roubles to meet local liabilities towards the end of each month.

Sanctions on Moscow Exchange and its clearing agent, the National Clearing Centre (NCC), led to a range of varying prices and spreads as trading shifted to the over-the-counter (OTC) market on June 14, obscuring access to reliable pricing for the Russian currency.

Against the yuan, which had already become the most traded foreign currency in Moscow before the latest sanctions were imposed, the rouble weakened by 0.3% to 12.00, according to an analysis of the OTC market.

It was down 0.1% at 95.52 against the euro.

Brent crude oil, a global benchmark for Russia's main export, was down 0.4% at $86.17 a barrel. (Reporting by Gleb Bryanski; Editing by Hugh Lawson)