London - Harlequins academy player Seb Adeniran-Olule has died in a car accident at the age of 20, the English Premiership club announced on Wednesday.
In a statement, Harlequins said that everyone at the London club was "deeply saddened" by the news.
Adeniran-Olule, a front-row forward, had made three first-team appearances for Quins, including in this season's European Challenge Cup pool game against Italian side Calvisano.
"Our thoughts and prayers are with Seb's family and friends at this difficult time," said Harlequins director of rugby Conor O'Shea.
"Seb was an incredible talent and had already represented England at under-age level, as well as making his senior debut for Quins at just 20.
"He will be sorely missed by the whole squad, as well as by the wider club."
Adeniran-Olule had been capped by England at Under-20 level.