Pantilimon prepared for battle
The 27-year-old Romanian left Manchester City for the Stadium of Light last month in the search for regular first-team football.
However, in order to achieve that this season, he will have to oust Italian Mannone, the Black Cats' Player of the Year for last season, and that is a battle be believes will be fought out during the remainder of pre-season.
"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."