Glen Johnson is backing Liverpool teammate Raheem Sterling for a big World Cup with England.
Sterling is pushing to start in their opener against Italy.
Asked if the winger could be England's secret weapon, Johnson said: "Hopefully he can. That would ideal if people don't know what he is capable of and people underestimate him a bit.
"That would definitely work in our favour. Hopefully it can work in our favour. Hopefully people will underestimate him and then he can prove them wrong.
"I think he has looked good all year. He is a young kid who is willing to learn about the game and he should just get better."
