The 28-year-old attacker joined the Parkhead club from Aston Villa last summer for a reported £3 million and started his tenure by coming off the bench on his debut to score the winner in a 2-1 Ladbrokes Premiership victory over Hearts at Tynecastle.
Brendan Rodgers’ side now stand a William Hill Scottish Cup final win against Aberdeen away from completing a domestic treble and are as yet unbeaten in Scotland.
Sinclair was voted Celtic’s top player this season by his team-mates and Hoops fans after hitting 25 goals so far in his debut campaign, and along with fellow Hoops duo Moussa Dembele and Stuart Armstrong and Aberdeen winger Jonny Hayes, is on the short-list for the PFA Scotland Player of the Year award.
Asked what he would say to other prospective top-flight signings, the former Chelsea, Swansea and Manchester City player said: “To be honest, there is not much more to encourage other players.
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“They just need to look at the team and what we have done.
“When you look at how big Celtic is, hopefully we can keep going unbeaten and get the treble and then all you need to do as a player is look at this success and think what a great club it is.
“Loads of players in the Premier League who are in and out of teams will definitely look at Celtic and think ‘yes I want to be part of that’ and that’s down to how well we have done as a team.
“The main thing to come here was to be happy and enjoy my football and that shows in me on the pitch.
“I have so many highlights since I have been here but the one that stands out is coming off the bench and scoring against Hearts, after not really meeting any of my team-mates at that time. That was special.
“I’m sure the manager will buy a few more players and add to the squad and if we can keep most of the team we can keep going and improving.”
Midfielder Armstrong’s personal highlight is his Scotland debut in the World Cup qualifier against Slovenia and he believes Carnlough man Rodgers is building something “quite special” at Celtic Park.
The former Dundee United player said: “You have seen the impact he has had in his first season and as we continue to improve in each game then he’s building something quite exciting.”
Dembele is also among three Celtic players on the Young Player of the Year short-list along with Kieran Tierney, Patrick Roberts and Hibernian striker Jason Cummings.
The French striker missed Saturday’s 5-1 win over Rangers at Ibrox with a hamstring injury but remains hopeful of being back for the season finale against Aberdeen.
He said: “I am just trying to be fit every day and working in the gym and we will see what happens.
“It would mean a lot as it’s the last game of the season and a final and a chance to win the treble, so it will be nice to be part of it.
“There is a chance for me but we don’t really set targets. With this injury you have to take care and make sure I am 100 per cent when I come back.”