Ironically the man who Scotland play at right back is an inch taller than Russell Martin.
For me Russell Martin is a top Championship right back, or a lower Championship / top League One centre back.
If he is insistent on moving inside this early in his career then I at least hope he is being made aware that he won't cut it in that position in the league above. I suppose he has to weigh up extending his football career or extending his top flight career, because whilst it wouldn't be a disaster having Martin at right back in the Premier League again - I do think it would be a disaster having him at centre back.
He does have ongoing health problems and is probably conscious of the stamina required at full back as he gets closer to 30, but I really just can't see us getting away with him at centre back in the league above so if he could keep on going for a couple more years at right back that would suit us. Whether it would suit him is a different question, perhaps he wants to be playing to 34/35 at centre back but willing to play at a lower level.
But he has just been made our team captain, and you can't wear the armband on the bench - which is where he'll be next season if we go up, if he is by then still considered a centre back.