[1] Obatoyinbo was born to an English mother and a Nigerian father, Iby, a founding member of the invitational rugby sevens team Racing Club Academy.
While at Harrow, he played rugby under the tutelage of the former Northampton Saints and London Irish centre and retired Scotland international, Joe Ansbro, who is also of African descent.
As part of his early rugby development, he spent the summer of 2018 in New Zealand, playing with the academy of National Provincial Championship side Wellington Lions.
[5] Shortly after his 20th birthday, Obatoyinbo made his first-team debut for Saracens on 27 October 2018, in a Premiership Rugby Cup match against Leicester Tigers.
During that season, he also spent time out on loan, helping Ampthill RUFC to achieve promotion from National League 1, and featuring for London Scottish in the RFU Championship.