Lamositele played football, wrestled and competed in track and field at Sehome High School. He started playing rugby three years ago. Lamositele played for the USA Rugby AIG Boys High School All-Americans before getting called up to the USA Eagles National Team. During the Eagles World Cup qualifier against Canada at Blackbaud Stadium on August 17 he broke the record for the youngest player to play for the Eagles. He was also a member of the Eagles Select XVs at the 2013 IRB Americas Rugby Championship in Langford, British Columbia. Following his Nov. 2013 start against Russia, Lamositele signed a contract with London Saracens of the Aviva Premiership.