 He also represented the under-19, under-20, and under-21 national sides.Jääger made his senior international debut for Estonia on 12 October 2002, when he came on as a 69th-minute substitute for Marko Kristal in a 3–2 home victory over New Zealand in a friendly.He made his 100th appearance for Estonia on 19 November 2013, a day after his 29th birthday, in a 3–0 friendly away win over Liechtenstein.