The report claims that Negredo's current wage of £112,000 a week could prove to be a stumbling block in a potential move for the 30-year-old.
A delegation from the Boro has reportedly travelled to Valencia on Tuesday to discuss both deals.
Need a VPN? Or seeking to switch? Then support Tribal Football by clicking here to sign up with our official partners NordVPN. Not only will you receive the best VPN experience, but also great discounts by signing up via Tribal Football. Thanks for your support!