Williams, 29, has had scans on his injured ankle in Cardiff this week and has already been ruled out of the World Cup double-header against Macedonia and Belgium.
Michael Laudrup said he had Williams on the bench at Southampton as a number and looking at the injuries they have I can see that.
"But it was good to have him a chance to have him here and take a look for ourselves.
"To be honest, I'm not sure when he will be back, but perhaps not for the next three games after the international break."
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