Strootman said that he had a good feeling about Roma as soon as he started to speak to the club about the move.
"PSV sold a lot of players during the last transfer window, but that is not what pushed me away," he told Voetbal International.
"To be honest, I didn't think I would leave. But what happened is very simple – I was strongly wanted by Roma and there was instantly a good feeling between us."
Strootman has 20 caps and two goals for the Netherlands.