Reus has drawn interest drawn interest from multiple clubs across Europe, including Dortmund rival Bayern Munich, according to Reus' agent. Reus has a buyout clause in his contract that can be activated in 2015.
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"Marco is a boy from Dortmund," Watzke said. "His feet are on the ground and his heart is in the right place. Despite his success, he decided himself to stay."
Reus has been with Dortmund since 2012 after spending much of his youth career in the club's system. He scored 16 league goals last season as Dortmund finished second in the Bundesliga.
The midfielder was set to play for Germany's national team in the 2014 World Cup but tore a ligament in his ankle during a pre-Cup friendly that kept him out of the tournament. Germany went on to win the World Cup, defeating Argentina 1-0 in extra time in the final.
- Ben Estes