Previously he represented Canterbury in New Zealand's domestic Mitre 10 Cup and the Crusaders in the international Super Rugby competition.
Jager made his international debut for Ireland on 24 February 2024 coming on as a replacement in the Six Nations match against Wales.
[5] He played for the Ireland U18 Schools side in 2013 [6] but he missed selection for the Leinster Rugby academy system.
During this time he also started playing club rugby in the Canterbury area with New Brighton RFC [2] Jager's dedication in coming to New Zealand in order to further his rugby career paid off in 2016, when great form at club level saw him named in the Canterbury squad for the Mitre 10 Cup.
With the Cantabrians already possessing Super Rugby props in the shape of Alex Hodgman, Siate Tokolahi and Daniel Lienert-Brown, Jager's appearances in his first season were largely limited to cameos from the replacements bench.