The Portugal midfielder handed in a transfer request late last Wednesday and was subsequently snapped up by Chelsea for a reported £12million.
"When I was in Porto, I knew that I wanted to go and the club wanted to sell me, and I only had to wait for the right choice," he told the club's official website.
"I felt that the new owners didn't want to sell me, but when I knew that Chelsea and Andre wanted me, it convinced me."
Meireles added: "It was strange, because I knew of the interest of Chelsea, and the interest of the coach, and it was a pleasure to come to this club but it was strange because it was on the last day.
"The people think that I wanted to leave and it is only because Chelsea wanted me. For Andre to want me, that is why I wanted to go."