Kerr began his professional career at Premier League side Birmingham City in 2011, having progressed through the club's youth ranks.
[2] Spotted playing for the Scotland under-16 team in the televised Victory Shield,[4] he moved to England at the age of 16 to begin a two-year scholarship in Birmingham City's youth academy.
[5] Much to his surprise, Kerr was included as defensive cover in the first-team squad for a 2010 pre-season tour to Hong Kong and China.
[2] Academy manager Terry Westley described the "tall and gangly" Kerr as having "good awareness on the ball", but said that it was "his change of pace that really convinced us to bring him here", comparing him with England international Matthew Upson at a similar age.
[7] His first competitive involvement with the first team came in January 2011, when named on the substitutes' bench for the fourth-round FA Cup tie against Coventry City.
[9] Named in the "B" list for Birmingham's 2011–12 Europa League campaign,[10] he was an unused substitute for the play-off round second leg against CD Nacional.
[16] On 31 May 2015, Kerr was involved in an incident in Fir Park following Motherwell's 3–0, 6–1 on aggregate, victory against Rangers that secured their place in the Scottish Premiership.
[27] He made his debut that evening at right-sided centre-back, played the whole of a 1–0 win at home to Eastleigh and, according to the Derbyshire Times, "A couple of crunching tackles in the first half would have drawn applause had fans been at the Technique.
[35] The following year he made six appearances for Scotland's under-17s, including two in the qualifying round of the 2010 European under-17 championships, and scored his first international goal, against Finland in the Nordic Tournament.