The Dortmund team decided to "patrol" their election promises intending to implement US President Donald Trump.
The latter stated that construction of an impressive wall will begin soon, which should enable protection from illegal immigrants from Mexico.
"The only wall we believe in," - the Bundesliga club posted a message on social media.
He was seconded by Mexican celebrity Rafael Marquez, who wrote: "There is no wall that can stop us if we believe in ourselves."