Pietersen, arguably England's most talented batsman, was off the field when the side completed a 347-run win over Australia in the second Test at Lord's on Sunday to take a 2-0 lead in the five-match series.
     
The South Africa-born shotmaker tweeted he was "stuck on a sofa tightly fastened to an ice machine" in a bid to be ready to play at Manchester's Old Trafford where the third Test starts on August 1.
     
And Anderson said: "As far as I know it was a strain so we'll keep our fingers crossed that he'll be fine for the Old Trafford Test. For him more than most, the next 10 days will be crucial, a lot of rehab and trying to get himself fit for next week -- which we're all hoping he will be."
     
There were no such worries for Pietersen's fellow England batsman Joe Root, who made a commanding 180 in the second innings at Lord's.

(Agencies)

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