Dwain Chambers is still waiting for selection for the World Championships, head coach Charles van Commenee.

Chambers could only finish second behind Simeon Williamson in the 100 metres at the Aviva UK Championships and World trials on Saturday.

Only the winner in Birmingham was guaranteed a place on the British team for next month's World Championships in Berlin, a fact which initially appeared lost on Chambers in the immediate aftermath of the race.

The 31-year-old still seems likely to be selected after winning the European Indoor title earlier this year, and also being picked for the European Team Championships in Portugal last month, where he won both the 100m and 200m for Britain.

But his controversial past, namely a two-year ban for failing a drugs test, means he cannot take anything for granted.

"It might be different with me but I finished in the top two," Chambers acknowledged with a smile after the 100m.

The team will not be selected until after the London Grand Prix at Crystal Palace next weekend, and Van Commenee admitted Chambers was not certain of a place.

"(He is) in the waiting room," Van Commenee said. "The other athletes can still race, a few will go head to head and we have to see what times they run.

"We just look at facts. We would like to see the best British athletes go head to head in one race but if that's not the case then we deal with it.

"The strongest factor is current form. It's more than just going through the rankings. We have to look at who beat who, when and how often."

Van Commenee also praised Williamson for his victory in 10.05 seconds, an impressive time given it was run into a strong headwind at Birmingham's Alexander Stadium.

"It was an outstanding performance which puts him in an entirely different bracket now," Van Commenee added.

"The margin of victory means he is a potential finalist (in Berlin)."

The weekend's other outstanding performance came from Jessica Ennis, who won the 100m hurdles and high jump to underline her status as a genuine medal contender in the heptathlon in Berlin.

Ennis was forced to miss the Olympics last year after breaking her right ankle, but has returned to competition and posted the best heptathlon score in the world this year on her comeback in Italy last month.

"Over the last few months she has been very consistent," Van Commenee added.

"Running 12.8 seconds is not special for a hurdler but it's very special for a heptathlete, the same with jumping 1.90m in the high jump.

"Consistency is vital in the heptathlon because you only get three attempts and also because of the fatigue."