"You'll see," Chandler says.
The Cardinals took the Heisman Trophy winner with the No. 1 overall pick last April ... but some in the NFL world have questions about his future because the guy is just 5'10", 207 pounds.
But, when we got Chandler out at L.A. Live on Wednesday ... he told us he's got NO doubts his new teammate is going to be just fine.
"Size don't matter," Chandler says. "I mean, look at Russell Wilson."
In fact, Chandler says he has no problems with Kyler having the goal of leading the Cards to the Super Bowl this season ... saying, "He's very mature."
"People talk about his speed and how fast he is -- it's not about his speed," Chandler adds ... "He throws accurate balls. He's going to shock the world! You'll see."
By the way ... ya gotta see how our photog's interview with Chandler ended -- it involves a hilarious phone call with the pass rusher's super famous brother, Jon Jones!!!