The Bundesliga outfit have qualified for next season’s Champions League, and as such are looking to bolster their playing squad ahead of 2012-13.
Spurs forward Van der Vaart has been linked with a move to Germany as his wife Sylvie works as a TV presenter there, and Schalke boss Huub Stevens has confirmed his interest in the Dutch attacker.
“His qualities are unprecedented,” Stevens told Sky Sports.
“I would love to work with him again. We have contacts with his agent. Every day I speak to Horst Heldt [Schalke’s general manager] on the phone about our plans.
“There are rumours circulating that Rafael would return to Germany. But I have not heard from his mouth. I have not spoken with him and we’ll have to see after Euro 2012.
“He has a contract so we will have to pay a ransom. If Rafa really wants it, he is welcome.
“If that opportunity arises, and he looks forward to it, let him come,” he continued.
Meanwhile, Kalou is out of contract at Stamford Bridge and Stevens confirmed that his side were battling the likes of Liverpool for his signature.
“Kalou is a Bosman player this summer.
“It’s obvious; there are many other clubs keen on him. Liverpool for example. But I know for sure he wants to move away from England. This could be our chance,” he concluded.
By Gareth McKnight