Pantilimon left Manchester City for the Stadium of Light last month in the search for regular first-team football.
He told the Sunderland Echo: "At this moment, I think everyone is fighting for their position. There's a long period until we start the Premier League.
"It's normal for everyone to work hard, train hard and after that, we'll see what happens. I think everyone wants to be in the first XI. We'll see.
"Vito is a good guy and a good keeper. I know that. But whatever happens, it's important that it helps the team.
"It's not just competition for us, it's everyone in the team. At this moment, no-one is in the starting XI."
For the big stories and the banter follow us on Twitter: @tribalfootball
Need a VPN? Or seeking to switch? Then support Tribal Football by clicking here to sign up with our official partners NordVPN. Not only will you receive the best VPN experience, but also great discounts by signing up via Tribal Football. Thanks for your support!