The Tottenham man, who has trained with his country ahead of Wednesday's fixture, has been linked with a move to Real Madrid during the off-season and has not taken part in the latter stages of Spurs' pre-season campaign.
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"We are not here to get in the way but if Gareth had a chance of playing he would be playing," Coleman told reporters. "The reason he is not playing is because mentally he is not ready and physically he is not ready to play.
"He has not been training at Tottenham and not enough sessions. This is not just for Gareth but any player, it is too risky. We have got a good medical team and after having talks with them the feeling was that it is too much of a risk.
"Whatever Tottenham Hotspur and Gareth Bale decide to do and whether he stays or goes is nothing to do with me, my job is when he comes with Wales and how he plays and is with us and that is all fantastic the other side is between Gareth and Tottenham."