Johnson, who earned 54 caps for his country between 2003 and 2014, has weighed in on the debate over who should be England's first-choice right back.
"It depends on who you're playing against of course, but I think Reece James is a better defender. I think he's quicker, stronger.
"Trent is great on the ball, he's a great footballer, and he's very smart and a lot wiser than his age suggests.
"But in international football, you get a lot more time on the ball, so I think Trent would be No 1, but Reece would be a fantastic back-up."