[1] Vossen made his Middlesbrough debut in a 2–1 win against Huddersfield Town on 13 September 2014 coming on as a substitute for Lee Tomlin in the 59th minute.

[2][3] On 8 August 2015, on the opening day of the English Championship 2015/16 season, Vossen made his Burnley debut against Leeds United in a 1–1 draw.

[7] On 13 March 2022, Vossen scored his 150th goal in the Belgian Pro League, slotting home a penalty-kick against Eupen.

[8] His goal also meant that he became a top-ten goalscorer in Belgian top division history since turning professional in 1974.

On 12 October 2010, Vossen scored his first goal in a 4–4 home draw Euro 2012 qualifying game against Austria.