Microsoft's potential purchase of Mojang, the Swedish company behind the popular block-building video game "Minecraft," may not be a big deal financially, but it could be the winning ticket to expanding its mobile business, analysts said.

The U.S. tech giant is in discussions to buy Mojang for an estimated $2 billion, The Wall Street Journal reported earlier this week, a deal analysts don't expect to impact Microsoft's profits given that it's roughly 2 percent of Microsoft's $86 billion cash hoard as of the end of June.