The European Central Bank will discuss next week whether to begin laying the groundwork to add the Chinese yuan to its foreign-currency reserves, according to two people with knowledge of the matter. Such a measure by the ECB would mark a major step in the internationalization of China’s currency, also known as the renminbi. While China is the world’s second-largest national economy, the yuan isn’t ranked among the most-held foreign reserve assets, according to data from the International Monetary Fund. The U.S. dollar leads at 61 percent of holdings.