Not too well it seems...

...his loan move is being given a 4 out of 10:-

"Midfielder Grujic was granted a temporary move to the Bundesliga in the summer to gain more first-team experience.

However, he’s had a frustrating spell in the German capital. After starting Hertha’s first four games he suffered a serious ankle injury.

Grujic recovered for three games but disaster hit in December as the injury flared up again".

Another wasted season then.