The home side was reduced to 10 men in the 58th minute when Brown was red-carded by referee
The Hoops came close to opening the scoring moments later when substitute
However, the Scottish champion was dealt another blow in the 76th minute when
But it was a spirited performance by
Despite that Forster had little to do and the home side was given a round of applause by its fans at the end of the game.
However, Brown's dismissal made an uphill task even more difficult.
Celtic plays Ajax in its next group fixture on 22
The 'Tifosi' display inside
Lennon kept changes to a minimum. Lustig replaced striker
Barcelona was without
Barca had dominated possession almost from the start of the game when the two sides met last November and in the early stages of this encounter it pulled the home side all over the park.
However, in the fifth minute Celtic cut its way through the visiting defence for the first time and Barca keeper Valdes denied Georgios Samaras at the expense of a corner which, although it came to nothing, boosted the home side's belief.
However, the Catalan side, playing in an unfamiliar all-black kit and without an out-and-out centre forward, kept a tight grip on the match.
Neymar had a drive from 25 yards in the 17th minute which went wide of the post before Iniesta dropped his shoulder to leave Hoops midfielder
It was an indication of Barca's impotence, despite its control of the ball.
Barca seemed in no rush to get a goal but five minutes from the break Neymar got a flick to a
In the final seconds of the first half Forster punched away a Xavi free-kick from wide on the left, after Lustig had fouled Neymar, but the resulting corner came to nothing.
The second period began with
Brown's dramatic sending-off, for foolishly aiming a boot at Neymar after fouling the Barca forward from behind, gave an edge to the atmosphere with the home fans clearly unhappy at the fleet-footed Brazil international.
As the home side dropped deeper, Forster made a save from
Four minutes later Celtic, fuelled by a sense of injustice, almost took the lead when Forrest fired in from the edge of the the box with Valdes having to make a great save.
But moments after he had replaced
With four minutes remaining Forster then made a great double save, first from Neymar's drive and then from
In the dying seconds of normal time Forster had another great save from Neymar when he raced clear of the fatigued Celtic rearguard.
With no points from two games, Celtic probably needs something from the forthcoming double-header with Ajax to keep its Champions League hopes alive.