"When I came from the Serbian league, I didn't really do a lot of defensive things," Grujic told the Liverpool Echo.
"I know that. The coach here wants me to do more in defence. He has said that. I am trying to work on those kind of things, and adapting to those demands.
"Everyone knows that the Premier League is of the highest standard. It's very fast, very physical, especially for young players.
"The key thing is that I continue to work in the gym, to work on the physical side of my game.
"I have been focusing on that with our coaching staff at Melwood. I am always in the gym before training, doing some special exercises. I know how important that is.
"I'm still learning. I'm still a young guy and I will work hard to try and adjust to English football, and to be part of this team.
"If I can get a chance to get some minutes and show off my skills and abilities, then I will be happy every time.
"It was very good for me to get my first start and to get 90 minutes under my belt. I needed that, I need to play more games if I am going to get better and better."