Chelsea are to make an improved offer for Sevilla defender Jules Kounde.
Sky Italia says Chelsea are preparing to move for Kounde in a €60m offer.
Kurt Zouma's on-off-on move to West Ham is set to see the Blues go ahead and push for Kounde - having already had an earlier offer rejected.
"It is true that there was an offer for Kounde that we turned down," club president Jose Castro explained to reporters on Wednesday.
"Right now there is no concrete offer for the player. If it comes, we will look at it as we always have done. If we have to [sell], we will do, as long as those resources can be re-invested in the club to keep improving and expand our trophy cabinet.
"While the market is open, anything can happen. We have players who could leave. Anything can happen this time of year until the 31st. It is a window where there have been few moves in most clubs, but not in ours."
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