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NADA said Wednesday it has established contact with Ullrich's management and aims to meet with the retired rider during the summer.
"All confessions give us insight," WADA chief Andrea Gotzmann said as the agency unveiled its report for 2012.
Ullrich was implicated around the affair centring on Spanish doctor Eufemiano Fuentes in 2006 and retired in 2007. He was later suspended for two years.
Last month, Ullrich told German Focus magazine that "I made use of Fuentes-treatments" but insisted he "wanted to level the playing fields" because nearly all other riders were also using drugs.
Ullrich did not go into details and did also not implicate other riders or officials.
NADA said that it conducted around 650 tests of German athletes in 24 countries in 2012, registering 97 violations of anti-doping rules of which 64 were positive tests. But only 25 athletes were sanctioned while 22 cases were dropped.
