He fell off Roy Hodgson's radar soon after moving to boyhood club Liverpool last season, where he found his opportunities limited to just seven Premier League starts under Reds manager Brendan Rodgers.
"It is only two years ago that I scored against Scotland. I scored 15 goals and then 13 goals for Southampton and obviously it is over a year since I did that but I have just got to get back to that now," the Birmingham Mail quoted him as saying.
He made the last of his 11 international appearances as an 80th minute substitute in England's 3-1 win against Scotland at Celtic Park in November 2014.
Lambert scored two goals in his West Brom debut against Bristol Rovers on Friday night, helping his new club win the match 4-0.
He refused to elaborate on a frustrating 12 months at Liverpool.
"I've got a lot of feeling, to be honest. I'm not going to get into it right now," he said, adding that striving for a national team return was something he would "never give up".
"I feel as if I've got a point to prove to myself. That's always the biggest drive, yourself. And it will carry on being that way."
West Brom manager Tony Pulis believes Lambert will have a positive influence on the younger members of his squad, especially 21-year-old striker Saido Berahino.
"He is a great lad and in Saido we've got a wonderful young talent and you're just hoping that a little bit of that experience and the way he conducts himself, the way he works, the way he does things will rub off on Saido as well," Pulis said.
(Reporting By Simon Jennings in Bengaluru; editing by Sudipto Ganguly)
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