Why Chelsea's Chavarria talks have been difficult

[Getty Images]Chelsea have been told Rayo Vallecano will not sell full-back Pep Chavarria unless his release clause, now worth £42.4m, is met.The Blues initially felt they had encouragement to pursue a deal but saw an opening £15m bid rejected. They have since indicated they are prepared to increase their offer to £21.2m, although that remains some way short of Rayo's valuation.Talks have been described as "complicated" by multiple BBC Sport sources after Rayo made it clear the