Barcelona overcame Celtic last night 1-0 thanks to headed goal from former Arsenal midfielder Cesc Fabregas with just over ten minutes to go.
Celtic felt hard done by after the referee, Frenchman Stephane Lannoy, showed a straight red card to the Hoops skipper Scott Brown for kicking out at Barca winger Neymar.
The win sees Barceona maintain there 100% record in the competition while Celtic are yet to secure a point after losing at the San Siro 2-0 against AC Milan.
The Barca boss praised his side's efforts after the game and believes the referee showed character by going against the crowd.
Martino said to reporters: "We dominated possession of the ball. We moved the ball around when necessary and we took a more direct approach when the game required. It was hard to break through.
"Cesc's goal wasn't the only chance we had. They had last year's game in mind, even with the positioning of Samaras. We expected it and played well in every way, very consistently over the 90 minutes.
"Apart from Valdés's save we didn't have any other problems.
"The sending off was correct, the referee saw it and had the strength of character despite adverse reaction from the crowd."
Barcelona are yet to loose and match this season, haven taken 21 points from a possible 21, and sit tied at the top of the league with Atletico Madrid.
The match winner on the night, Fabregas, who occupied Lionel Messi's false nine position, admits it was a tough match, but it was his side's best performance this season.
"It was tough. We knew it would be. They closed us down and played the long ball," said the Spaniard.
"We played a great game. Nobody really stood out or was worse than anyone else. It was the best all round performance so far this season."
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