Addo joined PSV Eindhoven during summer 1999 on a five-year contract, although he spent most of his first three years injured or as a substitute. He played just 24 times during this period, going out on loan at Roda JC for two years – before finally becoming a regular, as PSV retained their Eredivisie title in 2006. "I'm hoping now to show at Roda what I can do," Addo told Dutch magazine "Voetbal International". "When I moved to PSV there was a lot of pressure and obviously it got worst when I was injured. They paid a lot of money for me. I still need to show the supporters what I am capable of and the move to Roda is the solution for me."