France defender Eric Abidal admits he has yet to gel completely in the centre of the back four with William Gallas, with just five days to go until Les Bleus open their World Cup campaign against Uruguay.
Raymond Domenech's side have failed to keep a clean sheet in any of their World Cup warm-up games, conceding a goal in each of their matches against Costa Rica, Tunisia and China.
And Abidal, who plays at left-back for club side Barcelona, knows he must improve his understanding with Arsenal centre-back Gallas.
"It's always hard for a team to let in goals,'' Abidal told Telefoot. "Now I don't think that it's linked only to the defence.
"There are still some details to sort out with William, in the accuracy in the level of placement because William is used to playing in a certain position.
"It's up to me to be able to adapt and then to do movements in a block, as a team, and to try to do everything to plug the gaps that could occur.''
Les Bleus have been lambasted in the French press after Friday's defeat to China, a nation ranked 84th in the world.
The defeat capped a series of disappointing results which has seen them held to a 1-1 draw by Tunisia and come from behind to narrowly beat Costa Rica 2-1. However, Abidal is looking at the positives.
"I think that on the whole, we should still be pleased because we have conceded three goals but we have still had a victory and a draw," Abidal said. "So it's encouraging for us.''