[3][9] Porter signed for English club Leicester Tigers on 20 July 2020,[10][11] and made his debut on 22 August 2020 against Bath at Welford Road.
[12] At the end of his first season with the club he started in the 2020–21 European Rugby Challenge Cup final which Leicester lost against Montpellier to finish runners up.
[16] Porter started the 2022 Premiership Rugby final at inside centre and his defence was crucial as Leicester won 15-12 against Saracens.
[20][21] He retained his place for the final test as England defeated the Wallabies at Sydney Cricket Ground to win the series.
[28] In April 2024, Leicester Tigers announced Porter would be among five players to be released, also including England international Nic Dolly, at the end of the 2023–24 season.