"It was hard work in the first half because Hamburg played with six at the back. We switched things around a bit at half-time and we improved after that. We had a few problems keeping the pace of the game high. I’m pleased with the debuts for Douglas Costa and Arturo Vidal. They have quality and experience and will bring a lot to Bayern Munich. It was the first match and I’m satisfied with the performance."Pep Guardiola is satisfied with the win over Hamburg, but knows more work needs to be done.