Harry Kane believes it is too early to judge his attacking partnership with Wayne Rooney and Jamie Vardy.
On paper, the trio is a potentially exciting prospect, combining the country's record goalscorer with a pair of strikers who scored 49 times between them last term.
Thursday's 1-0 win over Portugal was the first time they had played together for England and they failed to spark.
Rooney was set to play as a No 10 for Roy Hodgson's side, behind Kane and Vardy, but time after time he pushed on through the middle as the latter pair drifted to the flanks.
"I don't think you can judge it on one performance," said Kane. "It's one game, the understanding isn't just going to happen overnight.
"We were asked to play together against Portugal and we won the game. Of course we would have wanted a few more chances and few more shots at goal, but it's something we are still working on so there is no reason for anyone to get too downhearted.
"It's a learning curve. These games were to prepare us for the Euros and I feel they have done that. We'll see what formation the manager picks against Russia and we will just do our best."
The final comment suggests Hodgson could yet ditch the diamond shape and play with authentic wide men in France.
Kane says the players are working on several options behind the scenes.
"It's not just that formation, we have been doing a few," he said. "It's important that you have that versatility going into a tournament so that if things aren't going right for you then you can change it.
"We have been doing two or three different formations and hopefully they pay off for us.
"We will start working towards the Russia game after a few days off and we will see what works best."
Kane broke his nose earlier this season and was forced to play in a protective mask, but avoided injury at Wembley when Bruno Alves kicked him in the head challenging for a high ball.
The Portuguese was dismissed for dangerous play but Kane escaped lightly from the incident.
"It wasn't a great challenge," he said. "I am happy I'm still here. I was lucky not to have a few stitches. I think he just caught me with the top of his boot rather than his studs so I got away with one."