The Hoops suffered a devastating last-gasp 2-1 defeat in Tuesday night’s dramatic Group G clash at the Nou Camp, having looked set to take a point from the encounter.
Neil Lennon’s men took the lead against one of the best club sides in the world when a Georgios Samaras header went in off the back of Barca’s Javier Mascherano.
But the home side hit back through Andres Iniesta just before the interval before Jordi Alba grabbed the decisive goal deep into injury-time.
Celtic may have returned to Glasgow without the points but took plenty of plaudits for a performance which followed a stunning away win against Spartak Moscow earlier this month. They sit second in the section on four points, having opened with a goalless draw against Benfica, and Forster has more belief than ever heading into the remaining group games, starting with the visit of Barca on November 7.
The goalkeeper, who showed why he was recently called into Roy Hodgson’s England squad with a superb display against the Catalan giants, said: “We’ve shown in the three games that we can pick points up from everyone.
“If we play like that in the home game against Barca, and then in the final two games, I don’t see why we can’t get out of this group.
“If we show the same attitude and application, I think we’ve got a great chance.”
Celtic chief executive Peter Lawwell paid tribute to the manager and players, as well as the thousands of Hoops fans who made the trip to Barcelona.
He is now hoping for another exciting tussle when the two sides meet again in the east end of Glasgow early next month.
He said: “It was a tremendous occasion and one that we were delighted to be involved in.
“The UEFA Champions League is the stage which Celtic strive to compete on, and we have shown this season that we deserve our place alongside Europe’s elite clubs.
“To play a team of Barcelona’s quality, rightly regarded as the best club side in the world, is the toughest football challenge we can face.
“But Neil and his players rose magnificently to that challenge and were desperately unlucky not to get what we all felt would have been a well-deserved point.
“We now look forward to welcoming Barcelona and their fans to Glasgow in two weeks.
“As for our own supporters, they have shown once again why they are so special and so important to the club.
“Their backing for the team throughout the match was tremendous and I’m sure they were very proud of the performance. To have so many fans travelling to Barcelona to support the team is a tremendous boost for Neil and the players, and I know it’s something they all appreciate. And we’re all anticipating another special European night at Celtic Park on November 7 when we face Barcelona again.”