Chelsea hero Jimmy Floyd Hasselbaink says management must be concerned about their player contracts.
As things stand, Antonio Rudiger, Andreas Christensen, Thiago Silva and Cesar Azpilicueta are all set to be out of contract with Chelsea on July 1.
"The problem is going to come for Rudiger and Christensen, if they haven't signed yet, in March, April, May," he told the Mirror.
“Because if they have got another club how will they be? How will they perform? That's going to be a problem.
“Can they keep Rudiger? What's the balance of that? Because if you have to replace him like-for-like it's going to cost you a lot of money.
“But on the other hand you also don't want him to earn a crazy amount of money, so much more than others as that takes the balance away from the team.
“You have to think about a lot of things. Can you get a replacement? Have you got one? Is it someone who can come through the youth set-up? Is it someone you're going to buy and develop? If that's the case you're definitely going to lose another two years to get another Rudiger.
“Chelsea are not in an easy position. It's very difficult. And Rudiger is in a better position because he just plays his football to the best of his ability and he's going to end up choosing the best thing for him – and that might end up being Real Madrid."
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