The match was the last for both teams before their World Cup openers, England facing Tunisia on June 18 and Costa Rica meeting Serbia the day before.
"It's more hard, no question". "No question. There's some serious decisions to take - but in a good way".
"The way that I play the game I was getting picked out more with passes and I just felt more comfortable at England".
"Why would I limit what they feel is possible?"
But Linekar dismissed suggestions that England's repeated failure is due to a collective inability to withstand pressure, pointing instead to poor youth development programmes over the past several decades. But I think you can learn from that experience and it can help you as a player to get better to want to get there again.
"So I think, looking at the next World Cup, we'll be really good". It was the type of goal that only a player full of confidence can score, which is all the more surprising when you consider that Rashford's first team opportunities at Manchester United this season have been limited. "[Fabian] Delph as a number eight is different to Dele [Alli] as a number eight".
South Korea was held to an unimpressive 0-0 draw against Bolivia while Iceland, the surprise packages of Euro 2016 who are looking to pull off more upsets in Russian Federation, drew 2-2 at home to Ghana after leading 2-0.
"We're asking them to open up quite a bit on their own feelings about things", Southgate said.
"I'm immensely proud and privileged to make my England debut and be part of this England group. It's pleasing to know you can rely on him but I don't believe he will necessarily start". "You can see the ability he has to hold people off, his speed and the strength when he is running with the ball".
Southgate had high praise for Rashford, who staked his claim to start England's World Cup campaign with a thunderbolt that dipped perfectly over Costa Rica goalkeeper Keylor Navas for his third global goal.
The squad head to Russian Federation on Tuesday, but downtime is now the order of the day. I felt like I got better service, I got the ball better. "It's starting to get slightly dishevelled".
With around 20 minutes of the game still to play, Costa Rica brought the 20-year-old defender on as a substitute.
Asked if he will be able to switch off, he said: "Absolutely no chance!"
Speaking on ITV after the 2-0 win, Ian Wright said: 'That's exactly what we need from a second striker, I love him there'. "We've discussed the possible situation over racism, which was certainly an important connection between the team".