Hertha Berlin goalkeeping coach Zsolt Petry has praised Jonathan Klinsmann four months after criticising the player's work ethic.
In March, Petry blasted the United States youth international -- son of former Germany captain and U.S. coach Jurgen Klinsmann -- for being "too American" and lacking work ethic.
"Jonathan has shown the right reaction," Petry said. "He now saves balls he did not save before. He invests even more time in his body, spends more time in the weights room, puts in extra units. I am impressed.
"He reflected himself instead of victimising himself, that's a good sign. He might have been mad at me because of my strong words, but it's my job as a coach to clearly show him how he can get better."
Klinsmann joined Hertha from college in California, and is one of six keepers under contract at the capital club.
Alongside 19-year-old Dennis Smarsch, who signed his first professional contract this week, he competes for the position as the club's third-choice behind the two experienced goalkeepers Rune Jarstein, 33, and Thomas Kraft, 30.