Reus has revealed he came close to signing for Barca in the past, but admits the prospect now is remote.
Dortmund meet Champions League opponents Barca in Spain tonight.
He explained, "Do I dismiss the idea of joining Barça in the future? I just extended my contract and when it finishes, I'll be 35 years old.
"For me it's a special match because it's the first time I play at Camp Nou. What more do I want?"