Jones to undergo scan on knee
Jones had bowled an impressive first spell, claiming two wickets, but felt a twinge in his knee when he return for a second stint and left the field after one more delivery. The seriousness of the setback is not yet known, but the ECB chief medical officer, Dr Peter Gregory, did not envisage him being fit in time for Lord's.
"Simon is currently rated very doubtful for next week's first Test match," said Gregory, after liaising with the Glamorgan physiotherapist, Chris Towers. "We will need to re-assess his injury after consultations with the specialist on Thursday."
Jones has made a careful return to action after leaving England's tour of India after twisting his knee in the nets before the first Test. He bowled 28 overs during Glamorgan's Championship match against Essex and, despite reporting some slight stiffness, came through unscathed.
England name their Test squad next Sunday with Ashley Giles and Michael Vaughan already ruled out and Steve Harmison unlikely to make it.