Brendan Rodgers' team suffered their heaviest European defeat when they lost 7-0 to the Catalan side in September
But Sinclair was heartened by Celtic's progress between their double header against Borussia Monchengladbach, when they drew 1-1 in Germany following a 2-0 home loss
And he believes they can make significantly greater advances when they try to get off the bottom of their Champions League group at Parkhead on Wednesday
"We have learned a lot and everyone will just be looking forward to that game, including the fans," the former Swansea, Manchester City and Aston Villa player said
"It's a massive game for us to prove ourselves.
"There's no apprehension
We've learned a lot from that game
Even when we went away to Monchengladbach we showed the difference when we conceded
We lost the game at home, but we went there and drew.
"I think we've learned a lot and hopefully now we're going in with a positive mindset.
"Manchester City beat Barcelona, so anything can happen and it's very different when you're playing at home
Being in front of our own crowd will spur us on because those fans are unbelievable
"Barcelona have been beaten here before, so, hopefully, we'll do it again."
Source : PA