Borlée also competes with the Belgian 4 × 400 m relay team. The team won gold at the 2012, 2016 and 2018 European Championships, and the 2015 European Indoor Championships. The team finished 4th at the 2008 Summer Olympics, 4th at the 2009 World Championships, won silver at the 2010 World Indoor Championships and bronzes at the 2019 World Athletics Championships and the 2010 European Championships, 6th at the 2012 Summer Olympics and 4th at the 2016 Summer Olympics.