"Texas hang in there. Sending love prayers and finance .... #texasboy," the actor wrote Wednesday alongside a video of himself discussing the telethon that will take place on Sept. 12.
"Just wanted to let everyone in Texas know, we got you. From a fellow Texan, my heart goes out, my prayers go out," Foxx says in the clip.
"September 12, we have a telethon that we're doing. We'll give you more details, so we can raise as much money as we can for everybody down there," he continues.
The 49-year-old also mentions how he has donated $25,000 to GlobalGiving to help with Harvey relief.
TMZ reports that Foxx will be hosting a telethon in Los Angeles with Houston native Hillary Duff being a potential guest while Blake Shelton and Reese Witherspoon will be hosting a simultaneous telethon in Nashville. A third one, in New York City, is also scheduled to feature Houston natives Michael Strahan and Kelly Rowland.