Stuart Pearce is determined to take the positives from Team GB's 2-0 defeat by Brazil after admitting his side lost to the likely Olympic gold medal winners.
First-half goals from Sandro and Neymar condemned Team GB to defeat at The Riverside on Friday night, with the opening group game against Senegal coming next Thursday.
Brazil were much the superior team and Pearce conceded it was a learning curve for his players ahead of the start of the football tournament.
"They are an outstanding side and favourites for the tournament, and you can see why," said Pearce.
"We understand the magnitude of the task in the Olympics. Whoever is going to beat them will probably have a gold medal, I would think.
"But we will draw the positives out of the game. We need to make sure we come to the boil next Thursday and beyond, and unless we play Brazil again, we might not play a side as strong as that.
"It was a real learning curve for us. We thought it would be a tough game and it was. It didn't help that we gave away two cheapish goals but we have to learn by it, prepare and get ready for Thursday."
Jack Butland played the second half and made fine late saves from Neymar and Alexandre Pato, with Pearce praising the Birmingham City goalkeeper.
He added: "He's an outstanding goalkeeper. He will be a great talent. I took Joe Hart to Manchester City when he was at a similar age, and this kid is up there with him.
"I look forward to the pair of them challenging each other for years to come.
"All he needs is the experience. His attitude and confidence, he is way above his years."