Moyes admits the Scotland fullback's fitness issues has been a problem this year.
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He explained, “The main thing is for him to get himself in the best condition, fit, train well, we've not got loads of cover at right back, we've not got loads of players.
"Opportunities come around sometimes when you least expect it and you have to be ready for it and that's when you've got to show what you can do.
"So I'd say that to all the players, be ready for when your opportunity comes and take it with both hands when you get it.”