Josh Norman is already getting behind his new QB -- telling TMZ Sports he feels Alex Smith is "underrated" for everything he's done in his career.
We spotted the Washington Redskins star cornerback in Atlanta and asked how he felt about the big quarterback moves in the NFL ... including his old QB Kirk Cousins getting an $84 million deal with the Vikings.
Norman looked a little bummed out (why not? he's a good quarterback) but explained, "It's business. Everything is business."'
He also explained why Cousins is worth every single penny.
By the way ... Norman -- super nice guy.