The English winger has been a revelation since signing for the club last summer, scoring 25 goals and assisting eight as the Hoops target an unbeaten season and a domestic treble.
He’s been rewarded with the club’s Player and Players’ Player of the Year awards as well as the PFA Scotland Player of the Year gong.
And, inevitably, talk will turn to his future, both at Celtic and away from Parkhead.
Sinclair is 28 and another strong campaign for the Hoops could see him attract interest in the Premier League.
But he’s not focusing on that – and believes his continued good form could be enough to get recognition from England manager Gareth Southgate.
Speaking on talkSPORT this morning, Sinclair said: “I still have an ambition to play for my country. That will never go. I’m going to keep working hard and if that call comes around then great. But I’m going to put my head down and concentrate on what I’m doing – helping Celtic win games and scoring as well.
“I’m just enjoying the moment – I’m not looking too far ahead. I’m at a happy place in my footballing career so I’ll just take it as it comes.”
Plenty of English players have starred for Celtic and Rangers over the years, yet only a handful have managed to earn caps for their national team.
Chris Sutton and Alan Thompson were in the peak of their careers playing at Celtic, but earned just one cap each in their careers.
The last time a Rangers player was capped by England came in 1996 when Paul Gascoigne was at the club.
So could Sinclair buck the trend and get a Three Lions cap while playing for Celtic?