"Jan Vertonghen is technically unbelievable and can play in any position," Son said in a post-match interview to BT Sport.
"I am very happy for him, he deserved it. One goal and an assist."
Vertonghen doubled Tottenham's lead in the 83rd minute when he got on the end of Serge Aurier's cross, but it was his assist for the first goal that was one of the main talking points of the match.
The 31-year-old spotted Son making a run to the back post before floating in a cross for the South Korean forward to volley home, a goal that 'rattled' the visitors according to Dortmund's Mario Goetze.
"The timing of the first goal was very important," Son added. "The cross was unreal, I didn't have to do anything, I just touched the ball."
Tottenham travel to Dortmund for the return leg on March 5.
(Reporting by Rohith Nair in Bengaluru)
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