Sunderland boss Sam Allardyce made a scouting mission to France yesterday.
Allardyce was among the crowd for PSG's 2-1 win at Lorient, as he took the opportunity to eye potential new recruits with Sunderland not in action until Monday.
Sunderland have been making several scouting trips to see potential targets over recent weeks, with the January transfer window six weeks away.
Olympiakos left-back Arthur Masuaku and Celtic midfielder Nir Bitton have both been watched by the Black Cats.
Meanwhile, Sunderland have been linked with a move for former Aston Villa centre-half Ron Vlaar, who is approaching the end of his recovery from a knee injury.
Vlaar left Villa at the end of his contract last summer, yet has remained without a club due to his injury rehabilitation.
Reports today have linked both Sunderland and Norwich with a move for the Dutch international.