James Dasaolu has warned Dwain Chambers that his time is up in British sprinting and revealed the pair are barely on speaking terms despite both training at the same Loughborough base.
The British duo are set to go head-to-head on Saturday at the English Institute of Sport in Sheffield, a venue where Chambers is unbeaten in 15 races, for the British Athletics Indoor Championships.
And their contest, which doubles up as the trials for the World Indoor Championships in Sopot, Poland, next month, has the potential to be fiery after Dasaolu said: "For me, the sport's kind of moving on and kind of progressing. We don't have to rely on Dwain to take up the mantle any more. It's not down to me to write anyone off. You get the likes of Kim Collins running personal bests [at the age of 37] but the time may have come where Dwain's not going to be at the forefront of British sprinting. There are other names and other people coming through."
As for the pair's relationship off the track, Dasaolu, who is 26, added: "I don't really talk to Dwain at all. I have nothing to do with Dwain Chambers. He's just in a different camp to me. He's in a different generation."
The comments by Dasaolu, who beat the 35-year-old Chambers comfortably in their first 60-metre race of the season in Glasgow two weekends ago, should add a frisson to the pair's on-track antics both indoors and outdoors this season, but are not necessarily good news for British relay ambitions. On form, they are both likely to feature for England in the 4x100m relays at the Commonwealth Games and for Britain at the European Championships.
Dasaolu is trained by Steve Fudge, who also coaches Adam Gemili. Last season, Gemili focused on the 200m but he is also expected to double up in the 100m and challenge Dasaolu, who set a best of 9.91sec over the distance last season.
But Dasaolu downplayed their rivalry. "I look forward to competing against him. He's a quick learner and he's doing very well. It's not me versus Adam, it's more like me and Adam against the rest of the world. It's a joint front."
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