The keeper who will be signing autographs at the Holland & Barrett shop in West Orchards at 2.30pm tomorrow, has a back injury which forced him off after only ten minute of City's 0-0 draw with West Brom last Saturday.
"Keiren hasn't done anything this week in terms of training. We have had the scan of his back injury and it doesn't show anything," said Chris Coleman to the CT.
"He might be OK for the weekend but I am in two minds to be honest, one because Dimi Konstantopoulos did so well against West Brom and two because Keiren won't be training today.
"If he trains tomorrow and is feeling stiff, I don't want him to start against Reading and then have to come off after 10 minutes. I would rather he didn't start, so we will see how he is come the end of the week.
"We don't want to waste a substitute and we also don't want to risk making it worse.
"Maybe we shouldn't have started him against West Brom because he only lasted 10 minutes and he didn't have anything to do and still had to come off, so I don't want that to happen again."