Plymouth Leander head coach Jon Rudd believes teenager Tom Fannon is making a "huge impact" in the pool.
The 16-year-old from Torquay took silver in the 50m freestyle at the British Swimming Championships, behind Leander team-mate Ben Proud.
Fannon finished in 22.48 seconds, less than half a second behind Proud, 20, who also won gold in the 50m butterfly.
"Tom's performance was certainly a huge impact on the meet and a real step up for him," Rudd told BBC Spotlight.
"In the next 48 hours the emails will start popping up to see which of our guys have been picked for the British teams, and I would hope these two are at the forefront of that."
The results over the five days of the British Championships count towards selection for four events, including the World Championships and the European Games.
Fannon had already shown promise by breaking the British age group record in the 50m freestyle last year.
"It's a dream come true really," said Fannon.
"I didn't expect any of the results I did and to swim against Ben Proud is absolutely amazing."
Proud shot to prominence when he claimed the 50m freestyle and 50m butterfly double on his Commonwealth Games debut at Glasgow 2014.
As well as his two golds at the British Championships the Plymouth-based swimmer picked up a silver medal in the 100m freestyle.
"I was expecting that sort of level," Proud told BBC Spotlight.
"I was trying to back up my performances from the Commonwealth Games and I feel like I did that.
"It was awesome to see Tom come second - the time he posted is outstanding, something I was never coming close to at his age."