JuJu Smith-Schuster says there's "no bad blood" between him and Antonio Brown ... telling TMZ Sports, "That's my guy."
Of course, as of just a few days ago that didn't seem to be the case ... 'cause the two seemed to be taking some passive aggressive shots at each other all over social media.
It all started just hours after the Steelers traded Brown to the Raiders ... when JuJu posted a pic of him catching a TD (with Brown watching in the background), writing, "I'm ready.