On as a 59th substitute for Jack Wilshere, the Saints captain cut past his man on the left and floated a delicate ball to the back post for Danny Sturridge to head home.
"I'm delighted, most of all really because last time out we had two defeats, against Chile and Germany, so it was great to be involved in a winning England display," he said.
"I just gave my best and that's all you can do, as everyone else does. We know it's the last time that we meet up before he names his 30-man squad at the end of the season.
"There's still 10 really important club games, not just for ourselves, but for our clubs as well, so I'll be concentrating on that now.
"Getting back to the club, keeping fit, in good form, and hopefully get three points at Palace at the weekend."
Asked if he now feels more part of the England team, Lallana added: "Yeah, I feel that I know the lads a bit more.
"Playing with them is only going to help. Nothing's guaranteed. It's been proven over the last couple of years that's the case.
"If anything, I've got to work even harder now, as Shawy has, Jay-Rod (Rodriguez) and Rickie (Lambert), and we'll see what happens at the end of the season."
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