He has previously played for FC Fyn, Odense Boldklub, Stjarnan, IF Brommapojkarna, Derry City and Dundalk.
During the 2011/2012 season he was in the team that won the Danish 2nd Division and subsequent promotion after a playoff with Hellerup IK.
[2] Due to a lack of appearances for Odense he joined Stjarnan to play in Iceland's premier division, the Úrvalsdeild.
[3] In 2014, Vemmelund made 17 league appearances in the season Stjarnan won the Úrvalsdeild for the first time in their history.
[10][11] He returned to Denmark in 2015 but after a few months at BK Marienlyst where he did not feature, in August 2015 he moved on a free transfer to IF Brommapojkarna to play in the Superettan.