Borussia Dortmund's Christian Pulisic has no limits - Andreas Herzog

United States international Christian Pulisic's career has no limits, according to Andreas Herzog.

In his first full pro season, the 18-year-old has already become one of the key players in Borussia Dortmund's squad. He has played in 21 of BVB's 25 league games, and featured in every Champions League match, starting six of them including the most recent 4-0 win against Benfica.

"He's already reached a significant level at 18," Former U.S. assistant coach and current U.S. Under-23 coach Herzog told kicker. "He now needs to raise that level year after year, which is not easy."

Pulisic has scored five goals and set up a further nine, drawing widespread praise, first in the United States and in recent weeks also in Germany, where he has been compared to both Henrikh Mkhitaryan and the young Mario Gotze during Gotze's breakthrough years at the Westfalenstadion.

Although Dortmund coach Thomas Tuchel last week played down the hype and urged Pulisic to keep his head down, Herzog has now told kicker that there are "no limits" for the winger.

"He's got an exemplary character, and in this sense good qualifications," Herzog said. "I dare him to do it, I don't see any limits."

Herzog said that it's now up to Pulisic's coaches to continue his development.

"Dortmund can consider themselves lucky to have two attacking grenades like him and [Ousmane] Dembele."

Herzog, who has closely followed Pulisic's progress over the last few years, added: "The development he's taken is no coincidence. The lad's got an unbelievable talent and potential. Jurgen Klinsmann and I realised that soon enough."

Also speaking to kicker, former Pulisic youth coach Hannes Wolf, who moved on from BVB's academy to second-tier club VfB Stuttgart during the season, said that the winger is at the right club right now.

"The responsibility is not pressed on his shoulders at BVB," Wolf said about Pulisic, who is under contract at Dortmund until 2020, and had been linked with a move to Liverpool prior to putting pen to paper on his new deal earlier this year.