England bowler James Anderson was forced out of county action for Lancashire with an injury on Tuesday - less than a month before the Ashes opener.
Anderson is set to be a key member of the England team against rivals Australia in a series that begins with the first Test at Edgbaston on August 1.
But the country's all-time record wicket-taker pulled up while bowling against Durham at Sedbergh.
Anderson tried three times to complete the over but was ultimately forced off to be replaced by Josh Bohannon.
The 36-year-old claimed his 950th first-class wicket on day two of the County Championship Division Two match on Monday.
