He's quick, strong and a competent full back having played there a lot. Plus there's no one better. He'd only be back up ffs.
An athlete yeah?
No seriously, he is so very limited at football that it hurts.
Wes Brown is a considerably more able footballer for example.
Not at right back, if he continues playing for Man Utd in the centre he's well in with a shout to go as back up for Rio and Terry though.