Paris Saint-Germain's deadline-day signing Danilo Pereira had lost his motivation at former club Porto and needed a new challenge, according to his agent, Daniel Lorenz.
The defensive midfielder has moved from the champions of Portugal to the title holders in France on a season-long loan, with a €16 million (£15m/$19m) option to buy at the end of the current campaign.
The 29-year-old spent five years with Porto, making 202 appearances in all competitions and winning two league titles as well as the Taca de Portugal, and Lorenz said his client felt it was time to move on.