A youth product of
Grasshoppers, Rhyner made his professional debut with his childhood team in a 2–0
2016–17 UEFA Europa League qualifying phase and play-off round loss to
Fenerbahçe on 25 August 2016. He debuted for Grasshoppers in the
Swiss Challenge League in a 4–0 loss to on 23 October 2016. On 30 January 2017, Rhyner was loaned out to
Schaffhausen to gain first-team experience in the
Swiss Challenge League. On 8 January 2018, Rhyner returned to Grasshoppers after a successful year with Schaffhausen. On 10 July 2019, Rhyner moved abroad and joined Spanish
Segunda División side
Cádiz CF on a three-year deal. On 5 October of the following year, after featuring rarely as his side
achieved promotion to
La Liga, he moved to
FC Cartagena in the second division, on loan for one year. On 16 January 2021, Rhyner moved to
Eredivisie side
FC Emmen, also in a temporary deal. On 30 June 2021, he was announced by the Greek
Super League side
Volos as their new transfer. On 8 July 2022, Rhyner returned to
Schaffhausen. On 17 July 2024, Rhyner signed a two-year contract with
Vizela in Portugal. ==International career==