GB's Dasaolu out of relay
James Dasaolu, the second-fastest British sprinter in history, will not run in the 4x100 metres relay at the World Championships on Sunday.
Dasaolu has been unable to take part in relay practice due to the hip problem which hampered his build-up to the championships and, despite two sub-10-second clockings this summer, will not be in the quartet.
That, UK Athletics relay coach Rana Reider confirmed, will be made up of Adam Gemili, Harry Aikines-Aryeetey, James Ellington and Dwain Chambers.
Reider said: "James hasn't been available for practice at all. We did some sessions before London (the Anniversary Games), but he hasn't been available since then.
"If he's having an issue and you don't know what he's going to be like coming through two or three rounds of the 100m, it's kind of hard to say he's going to be on the relay when these guys have been on the track together every couple of days practising."
Dasaolu admitted he was "disappointed" not to be selected, but said that he understood the decision.
"I would have loved to have been running with them but they are a very strong quartet," he added. "I wish the lads all the best for the competition."
Raider too admitted it was disappointing not to have a man in the team who ran 9.91 seconds earlier this summer and 9.97secs in the semi-finals of the individual event in Moscow.
"You'd like the 9.91 guy on the anchor, but in terms of relay sprints and the amount of practice we've put in, the speed of the baton and what we've been doing has been really good," he said. "Dwain's running really well and the rest of the three guys are running well."
Both Chambers and Aikines-Aryeetey failed to reach the final of the 100m and Ellington got to the semi-final of the 200m, but Gemili became only the second Briton to break the 20-second barrier for the 200m this week before finishing an encouraging fifth in the final.
And Raider believes this team can break the 14-year-old British record, set by Jason Gardener, Darren Campbell, Marlon Devonish and Chambers at the World Championships in Seville.
Since their memorable Olympic triumph in Athens nine years ago, Britain's relay team have handled the baton like a bar of soap, with drop after drop lurching them from one failure to the next. The team's hopes in five of the last six major championships have been dashed in such fashion.
Another drop came at the Anniversary Games, but Reider is confident the work the team has put in, under his guidance, on the changeovers will pay off in Moscow.
Reider, who was appointed by UKA after London 2012 when another dropped baton saw medal hopes dashed, said: "I watched the films of all the dropped sticks. I think if you have guys that have had problems on a lot of occasions I think it becomes a mental thing.
"These guys have known for a couple of weeks who's going to run where. I think they have an idea. We have to get it done and I put it on them.
"I'm there to help, but they have to take responsibility for what they're doing."
Raider insists the team "should medal" provided race day goes as smoothly as practice has been, but, given recent history, that is a huge assumption.
Raider has switched Gemili to the opening leg after he was at fault for the baton mistakes which cost the team at London 2012 and last month at the Anniversary Games.
"He handles the start a little bit better and he only has to have one hand-off, he's a little more comfortable with that," said the American.