Australia batsman Chris Rogers has undergone further scans after retiring hurt during the second innings of the second Ashes test against England at Lord's.
Rogers suffered a delayed concussion on day four of the match, having been struck by a James Anderson bouncer two mornings previously, and was forced to prematurely end his innings of 49.
The condition was later described by Australia team doctor Peter Brukner as a "delayed ear problem" but Rogers continues to be monitored for further symptoms of the head blow with a week to go until the third Test at Edgbaston on 29 July.
The 37 year old missed the entire test series against the West Indies earlier in the year after being struck in the nets and intends to retire after the five-match Ashes series, which is currently locked at 1-1.
Despite scoring a Test-best 173 in the first innings and honing in on another half century in the second, Rogers suddenly dropped to the floor at Lord's after alerting fellow opener David Warner over his condition.
"He actually said to me 'The grandstand is moving', and I said 'No it's not'," Warner said. "I was worried, I had no idea what was going on, and so was he.
"He said 'I don't know what's happening here', so I said 'Just sit down'. I came down the wicket and I had to look twice because I didn't really know what was going on and with all the talk of him."
Despite undergoing further tests, it is expected that Rogers will take his place in an unchanged Australia team in Birmingham, though he will not feature in the tour match against Derbyshire starting on 23 July.
"Chris's condition is certainly improving. He has had scans and seen a specialist to help determine the cause of his dizziness," team medic Brukner said. "The initial scans have cleared him of any serious damage and we await the results of further tests.
"It appears the most likely diagnosis is a delayed ear problem related to being struck on day two of the test match. We are confident that this is something we can manage in the lead up to the third test at Edgbaston.
"As a precaution he'll be reviewed by the specialist in London again on Wednesday morning before rejoining the touring party. Chris was not scheduled to play in the tour match against Derbyshire, so he has time to continue resting ahead of the test match."