I think this is very likely a replacement for DCL and a good indicator that he is leaving.
If Chelsea want to keep him long term and it is only going to be a loan, then Broja has a number of options. The main factor for him and Chelsea will be playing time, so he can continue his development. At Southampton he was their main striker last year and could be again. With DCL here, he will not be a regular starter for us. If Chelsea are open to selling Broja, then with the little money we have, it makes sense that we would focus on the key areas where we are short, such as midfield. If we are willing to pay Chelsea more than £25m from our limited budget then I think it means we expect to be short in the CF position.
Broja is a very good young player who I watched a lot at Vitesse even before at Southampton and would be an very good signing if DCL goes.