London copper was set for a second weekly rise on Friday, underpinned by prospects of a demand recovery later in the year, but traders said concerns over Greece and slowing growth in China would crimp gains.

Three-month copper on the London Metal Exchange was trading at $5,792.50 a tonne by, after closing a tad firmer in the previous session. It was on track for a weekly gain of 0.6 percent, having dropped 4 percent in June, and is still down 8 percent for the year.

Shanghai Futures Exchange copper edged up 0.3 percent to 42,300 yuan ($6,818) a tonne.

U.S. jobs growth slowed in June and Americans left the labor force in droves, tempering expectations for a September interest rate hike from the Federal Reserve. U.S. markets are closed on Friday for a public holiday.

The International Monetary Fund delivered a stark warning on Thursday of the huge financial hole facing Greece as angry and uncertain voters prepare for a referendum that could decide their country's future in Europe.

China's securities market regulator has opened an investigation into suspected market manipulation after a slump of more than 20 percent in Chinese stocks since mid-June.