It added: “Robbie was the epitome of a runner’s runner, embodying everything we value at Phoenix.”
Robbie Fitzgibbon joined Brighton Phoenix as a junior, and through “dedication, relentless hard work, and determination”, he became a GB senior international-level athlete, the club said.
In 2019 he competed in the senior indoor European Championships, reaching the final, and went on to compete in several Diamond League races.
His coach and mentor, Joel Kidger, said: “Robbie was talented but, even more so, a hard worker.
“He was gritty, determined, and usually got to where he wanted.”
