Hertha Berlin sporting director Arne Friedrich says Matteo Guendouzi a "great player" and says his recent improvement shows clubs benefit from taking the time to help players.
Guendouzi joined the Bundesliga side on loan in October after he fell out of favour at Arsenal under Mikel Arteta and questions were raised about his attitude.
The 21-year-old has become a key player for the German side, having made 21 appearances and scored two goals, and Friedrich says Hertha have had no complaints about the Frenchman's behaviour or impact.