Aaron Ramsey is an injury worry for Wales' opening World Cup qualifier against Moldova on 5 September.
Midfielder Ramsey, 25, came off in Arsenal's Premier League opener against Liverpool because of hamstring damage.
An Arsenal spokesman confirmed: "Aaron has a hamstring injury and is being assessed."
The injury came after news that Crystal Palace midfielder Jonny Williams, 22, will miss Wales' opening three qualifiers with an ankle injury.
Williams was injured in a pre-season friendly against non-league Farnborough and is expected to be out for up to 10 weeks, making him a doubt for the games against Austria and Georgia in October.
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