Cesar has long been linked with a move away from Rangers, following their relegation from the Premier League.
Cardoso told Lancenet: “(Schalke’s) interest is real but I believe it’s complicated as the window closes in a few days. But the negotiation can happen in January.”
Cesar has been linked with the likes of Arsenal, Benfica and Fiorentina during the transfer window.
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Liverpool have unveiled their new home kit for next season, sticking with the hugely popular retro styling of the current shirt.
The reputation of the Premier League means it is the most popular and one of the most watched leagues in the world.