On 29 September 2012, he made his first team debut, coming on as an 87th-minute substitute in a Scottish Premier League match against St Mirren, replacing Iain Vigurs in a 5–4 defeat. His first start came on 20 October, in a 3–2 win over Hibernian. Ross scored his first goal in senior football on 3 November 2012, in a 2–1 win against Aberdeen.
