By FOX Sports staff
The 27-year-old has been at Dortmund since 2008, when he joined them from Figueirense, but has had to settle for a reserve role in recent years due to Mats Hummels and Neven Subotic forming a formidable partnership as the team's first-choice centre-back pairing.
However, a lengthy injury to Hummels has seen Santana thrown into the fray and he was showed coach Jurgen Klopp what he is capable off, scoring the dramatic winner that helped them to a 3-2 aggregate win over Malaga in the UEFA Champions League quarter-finals.
But with Hummels back in action, Santana is set to return to his place on the bench once more and the Brazilian admits he might have to consider his future at the end of the season, especially with the 2014 FIFA World Cup on the horizon.
"I am not sure myself about what will happen in the summer," he told Bild.
"It's hard to deal with the fact that I only play when Mats or Neven are injured, and it's my dream to play for Brazil in the World Cup on home soil.
"My agent is doing everything. When the season is over, we'll have a discussion with [sporting director] Michael Zorc about what is best for both parties."
Santana is yet to win his first cap for Brazil and he might find it hard to force his way into the Selecao side given they have no shortage of quality defenders, including the likes of Thiago Silva, David Luiz and Dante.