This powerhouse England international prop currently plays for Wasps after leaving Northampton at the end of the 2017/18 season.
He played 73 times for Saints after joining them from Newcastle Falcons in 2015.
He previously appeared 81 times during two spells with the Falcons between 2009 and 2015, which were broken by a two-year stint with Leicester Tigers.
The Stoke-on-Trent born front-rower has won 16 England caps since making his debut against New Zealand on the 2014 summer tour, and was part of the 2016 Grand Slam winning squad and the 2015 Rugby World Cup side.
Kieran's early career was spent at National two club Fylde, during which time he played age-group rugby for Ireland prior to committing to England by making his Saxons debut against the USA in 2011.
He is mainly known as a tighthead-prop, but has experience across all three front-row positions.