The Celtic star, who turns 28 on Saturday, is desperate to force his way into national boss Southgate’s plans after a blistering first season in Scottish football.
Sinclair has scored 18 times and starred for the Hoops in the Champions League.
And the former Aston Villa, Manchester City, Swansea and Chelsea winger reckons plying his trade north of the border should not be a barrier to a Three Lions cap career.
Sinclair said: “I would love to play for my country. My ambition is still there.
Stars who have played in both Scottish and English Premier Leagues
Fri, April 15, 2016
Express Sport takes a look at some of the greatest players who have appeared in both the English and Scottish top flights in recent times
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Express Sport takes a look at some of the greatest players who have played in both the Premier League and the Scottish Premier League (now Scottish Premiership)
“I just have to keep my head down and hopefully my time will come.
“There are not many English players playing Champions League football. Once we qualify again, I don’t see why it can’t help.
“For me it’s about working hard, getting my form back, which I have, and scoring goals and creating them in games.”
Sinclair has been capped at all age groups for England through to Under-21 level and believes he’s in the form of his life at Celtic.
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Scott Sinclair wants an England call-up
Southgate’s squad are preparing for games against Germany tonight and Sunday’s World Cup qualifier against Lithuania.
Sinclair added: “There was speculation of me getting in the full team when I was at Swansea, but that was a long time ago.
“It’s another level. It would be great to play for your country – any player will tell you that.”