 Imhoff has been a member of the Argentina squad that competed in the Rugby Championship in 2012, 2013, 2014 and 2015.Imhoff played at the 2015 Rugby Championship, where Argentina reached the 3rd place, scoring 3 tries in the historical first ever win over South Africa by 37-25, in Durban.This historical feat made him one of the two top try scorers of the tournament with 3 tries and 15 points.