[1] Swiel attended Bishops in Cape Town and played in their first side in 2010 and 2011 alongside Dillyn Leyds, Oli Kebble and Johnny Kôtze.

His senior debut came during the 2013 Vodacom Cup competition, coming on as a substitute in Western Province 17–17 draw against Boland Cavaliers in Ceres.

He made his Super Rugby debut, replacing Patrick Lambie in the sixth minute of the Sharks' match against the Bulls in Pretoria.

[11] Swiel made a total of six appearances during the season and scored 38 points as his side finished top of the South African Conference before losing to the Crusaders in the semi-final.

In October 2014, English Premiership side Harlequins signed Swiel as short-term injury cover for Ben Botica.

Swiel made a total of ten appearances for Harlequins during his loan spell – starting five of those matches – and scored 75 points before returning to the Sharks before Round Three of the 2015 Super Rugby season.