"The barrier to QE is still very high," said one of the sources, all of whom requested anonymity, adding that discussion at the meeting was expected to centre on reinforcing existing policy measures of credit easing and liquidity provision, according to Reuters.
Wall Street stalled, holding the Standard & Poor's 500 Index near record highs.
In late afternoon trading in New York, the Dow Jones Industrial Average inched 0.09 per cent higher, while the Nasdaq Composite Index eked out a 0.06 per cent gain. The Standard & Poor's 500 index was unchanged at 1,999.98.
The Dow moved higher as gains in shares of UnitedHealth and Pfizer, up 2 per cent and 1.1 per cent respectively, outweighed declines in United Technologies and IBM, down 0.6 per cent and 0.5 per cent respectively.
"Many of the blocks are in place for the equity markets to make further progress," Richard Hunter, the head of equities at Hargreaves Lansdown in London, told Bloomberg News.
Shares of Tiffany rose, last up 1.35 per cent, after the jewellery retailer reported second-quarter profit that surpassed expectations and lifted its full-year earnings forecast.
"These healthy second quarter results reflected solid sales growth in our stores, particularly in the Americas and Asia-Pacific regions," Michael Kowalski, Tiffany's chief executive officer, said in a statement. "In addition, an improved gross margin was an important contributor to the earnings growth."
In Europe, the Stoxx 600 Index ended the session 0.1 per cent higher than the previous close, as did the UK's FTSE 100. France's CAC 40 closed with an advance of 0.04 per cent. Germany's DAX slipped 0.2 per cent.