Australia opener Chris Rogers was forced to retire hurt after suffering a dizzy spell on the fourth morning of the second Ashes Test against England at Lord's on Sunday. (Scorecard)
After two overs' play on Sunday, Rogers crouched down by the side of the pitch and then sat motionless. (England Must Save 150 Overs to Save Ashes Test: Stokes)
Concerned batting partner David Warner signalled for medical staff to come out on to the field and after a few minutes' treatment, Rogers, who had added five runs to his overnight score, walked off on 49 not out, with Australia 114 without loss. (Steve Smith Joins Aussie Greats in Elite List)
The 37-year-old Rogers, who has said he plans to retire after the end of this series, received sympathetic applause from a packed crowd at Lord's, where he spent several seasons with Middlesex, as he made his way into the Pavilion.
"Chris Rogers suffered a sudden dizzy spell while batting," team doctor Peter Brukner said later Sunday.
A team spokeswoman added that Rogers, who had shown no signs of illness before play started Sunday, was still at Lord's.
Rogers missed Australia's recent 2-0 series win in the Caribbean with concussion after being hit on the head while batting in the nets.
And during the first innings of this match, during his Test-best 173, Rogers was struck flush on the side of the helmet by James Anderson when he turned his head away from the opening ball of Friday's second day.
Rogers's place in the middle was taken by Steven Smith, whose first-innings 215 was also his highest score in Tests.
England lead the five-match series 1-0 after their 169-run win in the first Test in Cardiff last week.
The subject of increased protection for players has been been much discussed within cricket following the passing of former Australia batsman Phillip Hughes, who died after being struck in the neck by a bouncer in November.