Botswana's Isaac Makwala granted time-trial in attempt to qualify for the 200m semi-finals

Botswana's Isaac Makwala, who was denied a place in the World Championships 400 metres final on medical grounds following illness, has been granted a time-trial on Wednesday night in an attempt to qualify for the 200m semi-finals.

The 30-year-old had been expected to challenge favourite, and Olympic champion, Wayde van Niekerk of South Africa over one lap, but was prevented from competing after a bout of sickness. Van Niekerk won gold on Tuesday night.

Video footage showed Makwala was prevented from entering the warm-up track and Botswanan officials criticised the IAAF for their heavy-handedness and lack of communication over cases of norovirus, which have struck at the championships in London.

Now Makwala will be permitted to run on his own in a bid to progress in the 200m.

Makwala had been given medical dispensation to withdraw from the 200m heats on Monday night.

Without a valid reason for pulling out, he could have been disqualified from the 400m final - an event he was forced to miss under protocols imposed by Public Health England.

Now his 48-hour quarantine is over, the IAAF has accepted a request to allow Makwala to try to qualify for the shorter event.

He will run at 1840BST - 25 minutes before the official start to the evening session on day six - and, should he achieve the qualifying mark of 20.53 seconds, will compete again in the semi-finals, which are scheduled to begin at 2055BST.