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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Summer 2016 is set to be a very exciting time for football fans, as this is when the long awaited Euro 2016 tournament kicks off.
Since Guus Hiddink arrived at the helm, Chelsea have improved considerably after a tricky start to the campaign.