Incidents Since Joining Munster:
Since his move to the Irish province, Jager has had at least three confirmed instances of head injuries:
- November 2025: Jager was listed as following return-to-play protocols after a Head Injury Assessment (HIA) during a match against Argentina XV[1].
- May 2025: He was unavailable for Munster's URC clash against Benetton due to a head injury[2][3].
- January 1, 2024: In a match against Connacht, Jager suffered a concussion from what was described as a "strange looking tackle" and was stretchered from the field[4]. Following this, he entered the graduated return-to-play protocols[5].
Additionally, in February 2025, during an Ireland A fixture, Jager was forced to leave the match due to injury. While several other players in that game sustained head injuries, it is not explicitly confirmed if Jager's was also a concussion[
6].
Most Serious Incident with the Crusaders:
The most severe publicly documented concussion of Jager's career occurred in August 2020 while he was playing for the Crusaders in Super Rugby Aotearoa. In a match against the Highlanders, Jager was knocked unconscious by a reckless, off-the-ball tackle and had to be carried from the field[
7]. The incident, which resulted in a yellow card for the opposing player, was significant enough that his coach, Scott Robertson, commented on its severity, noting that Jager was "knocked out"[
7].
It is also worth noting that towards the end of the 2022 season with Canterbury, Jager sustained a neck injury that ultimately required surgery[
8][
9]. While not a concussion, a significant neck injury can be a related concern for front-row forwards.