By Josie Cox 

European stocks jumped on Tuesday and the euro sank on news the European Central Bank is considering buying corporate bonds--a move that would beef up its program aimed at stimulating the continent's sickly economy.

No specific plan had been discussed, one person familiar with the matter said, and there is no timetable yet for when such a step may be considered. Earlier, Reuters reported that the central bank may decide on the matter as early as December and could begin buying early in 2015.

"If reports are true, then the ECB is moving even closer to outright quantitative easing," currency strategists at U.S. bank Brown Brothers Harriman wrote in a note.

BNP Paribas strategists, meanwhile, said that they deemed it likely the ECB would go ahead with such a program, "given that the measures already announced by the ECB to reach balance sheet levels of 2012 will likely fall short."

The ECB hasn't set a hard target for the amount of assets it intends to purchase, but President Mario Draghi has said that the central bank is seeking to expand its balance sheet toward levels last seen in early 2012, suggesting the combined scheme--including a new bank-lending program--could be worth at least EUR700 billion ($894 billion).

The euro fell to trade around 0.3% lower against the dollar, at $1.2750 by midday, marking the day's low. It was trading around 0.2% lower against sterling. The Stoxx Europe 600 was trading 1.5% higher by late morning, extending tentative gains from earlier in the day. German and French stocks climbed by a similar degree, while Italy's FTSE MIB index climbed by 2.3% and Spanish stocks rose by 1.9%.

The iTraxx Main index, which reflects investors' confidence levels in debt issued by a large number of corporate bonds in Europe, was trading around 0.05 percentage point tighter on the day, the biggest boost in sentiment since the October ECB meeting.

"As a rough guide, they could purchase around EUR50 billion over a one-year period under current market conditions, and perhaps as high as EUR100 billion if purchases improve market conditions," said J.P. Morgan in a note to clients.

Stefan Isaacs, a corporate-bond fund manager at M&G Investments wasn't surprised by the news. "They've alluded to buying corporate bonds before. I struggle to see that it will make a huge difference given how low corporate funding costs are already," he said, describing it as "another dodging tactic ahead of ultimately buying sovereign bonds."

"This just reinforces the notion that [sovereign QE] is politically challenging to do, and they will explore all other avenues before then," Mr. Isaacs added.

The news comes just a day after the ECB said it had started buying covered bonds, which are backed by a pool of loans such as residential mortgages, and are widely considered as the safest type of debt that banks sell.

-- Brian Blackstone and Ben Edwards contributed to this article

Write to Josie Cox at josie.cox@wsj.com

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