James Anderson will be assessed by England's medical staff overnight after leaving the field with a "tight side" on day two of the third Ashes Test.
Anderson, on his 33rd birthday, was seen stretching and wincing at the top of his mark in the evening session and walked off after aborting his run-up mid-over.
The England and Wales Cricket Board tweeted: " @jimmy9 has a tight side. He will be assessed overnight and in the morning #getwellsoon #ashes".
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Side strains can be particularly troublesome for fast bowlers and with the fourth Test due to begin next Thursday, England's leading Test wicket-taker is a doubt for the trip to Trent Bridge.
Fortunately Anderson's side are in such a dominant position in this test match, Australia closing day two on 168 for seven with a lead of just 23 runs, that England will remain confident the absence of their leading wicket taker will not affect the result.