"It is well documented that we have put in a number of bids for Santa Cruz," he told Sky Sports News.
"He is a player I have worked with before and I think that he could help us.
"Obviously it has been going on for some time now and it is obviously Blackburn's prerogative to turn down any offer we make.
"We are trying to move that process forward.
"If it happens we will be delighted, but if not we will have to move on and look at other targets."