Seymore spent his youth career in England with Colchester United and Cambridge United Academy along with playing for Cambridgeshire FA county team and England U18 schoolboys.[1] He then joined Soham Town Rangers before signing a letter of intent to play college soccer at Oregon State University.[2]
College
A four-year starter at Oregon State University, he made a total of 73 appearances for the Beavers and tallied seven goals and nine assists. Earning PAC-12 second-team honors, PAC-12 honorable mention and TopDrawerSoccer top 100 freshman list.[3]
On January 20, 2015, Seymore was drafted in the third round (56th overall) of the 2015 MLS SuperDraft by FC Dallas.[7] However he was cut from camp and would later join Lane United FC where he made seven appearances.[8]
Following Whitecaps FC 2 folding, Seymore joined FC Cincinnati on November 21, 2017.[11]
Following a successful loan spell at the end of the 2018 season, Seymore joined Reno 1868 permanently on January 10, 2019, where he helped them reach a conference semi-final and finish 2nd in the regular season.[12]
In a stop-start season, shortened, due to the COVID-19 pandemic, to an 18-game league season, he made 13 appearances in the League, as Sligo finished in fourth place, qualifying for the Europa Conference League.[14]
Seymore made a further two appearances in the FAI Cup as Sligo reached the semi-final, before losing to eventual runners-up, Shamrock Rovers.
On January 2, 2022, Seymore returned to the United States to sign with USL Championship side New Mexico United. He helped the club reach 3 playoffs in three years and helped the club finish 1st in the western conference regular season, the first time in club history.[16]