The 25-year-old wants to be the leader at the back that can guide the team to success for the players that are unable to contribute currently.
"We all have to step up as players and fight for our positions, our team-mates," he said.
"We need to play for the lads that are injured, the likes of Aymer and Leroy [Sane], we need to work hard every day in training and set the standard for everyone.
"That's what brought us success last season, how much we trained on things and pushed each other, fighting for positions, we have to take the responsibility as individuals and as a team.
"It's been difficult getting injured. It was difficult because it's me out of the team not being able to be there for the team and be selected for the manager.
"I'm trying to stay as fit and healthy as i can now and get a run of games when called upon to try and do my best for the team and for myself. I feel good again, I feel fit and I need to stay like this for as long as I can - for the rest of the season hopefully."