Team GB defender Alex Scott has admitted that Canada striker Christine Sinclair is the player they most fear ahead of their quarter-final clash on Friday.
Hope Powell's side, who topped Group E, will face Canada this evening before a potential semi-final clash with the United States.
"Sinclair is a great player, a real poacher, we're going to have to watch her. She has so much class and composure and is a real danger," Scott told the BBC.
Team GB have yet to concede a goal at the Olympics.