The private-equity firm Silver Lake, Alibaba Group Holding Ltd. and Russia’s Digital Sky Technologies are discussing a possible joint bid for Yahoo! Inc., according to Bloomberg’s secret source.

The group contacted Yahoo and its advisers in recent weeks to inform them of a possible offer. The discussions are still at an early stage and it’s not certain that the group will agree to make a bid, the people said.

Alibaba Chairman Jack Ma said last week he is “very interested” in buying Yahoo, six years after selling a 40 percent stake in China’s biggest e-commerce company to the owner of the most-visited U.S. Web portal.

Yahoo is reviewing its strategy to revive growth and attract more users after firing Chief Executive Officer Carol Bartz last month.