Celtic manager Neil Lennon  was pleased with the work of his team despite the defeat. 'I am very happy with our performance. Actually, we played very well. It was a shame we started badly and made it all uphill. It was always going to be difficult against an opponent like Atletico,' he confessed.   The Scottish coach lamented the first goal, which came after just 2 min .'It is frustrating that it came from a set pieces because it is an aspect of the game we train very hard,' he said.   About Diego Ribas, who made his debut at the Calderon and scored the second goal, Lennon said that he is a player of 'high quality' and that 'besides Atletico suiting his style of play.' The Scot has no doubt that the rojiblancos 'can win the tournament.'