The Mooloos lock won two Super Rugby caps under Dave Rennie in 2015 and has another chance to impress the departing Chiefs coach, who takes the reins at Glasgow for their next season starting in September.
Alainu'uese, 23, is understood to have inked a three-year deal after signing on a short-term contract last October, which was due to expire in May.
Waikato Rugby have released Alainu'uese from his Mooloos contract for 2017 and allowed the 2.02m lock, who weighs over 130kg, to sign professional forms for Glasgow.
