Good news, San Diego ... Landon Donovan's working on your replacement -- YOUR VERY OWN MLS SOCCER TEAM!!!

Philip Rivers and the rest of the Bolts packed their bags for L.A. last year ... and in their wake -- they left a giant plot of land for the city to use.

That's when Donovan stepped in and helped spearhead an effort to fill that space with a new stadium, restaurants, housing, shopping -- and a new MLS futbol team.

So, what'll it take for Landon to get all this done??

"If people in San Diego want this to happen and want this to be a part of the future of this city and impact people for decades to come," Donovan tells us, "then they can vote 'yes.' Our measure is Measure E."

The vote's Nov. 6 ... and Donovan's promising a space of land that will rival what L.A.'s got downtown by the Staples Center if it goes down.