You already have your answer in Rafael though. He gets an 8 rating each and every season from the second season onward for me. I refused big money for him and he's gone on to captain the side and become a club legend in under 5 years of me managing Man UTD.
I'll assume you sold him though :C . You have many options such as John Stones, Dani Carvajal, Danilio, Gino Peruzzi (more of a backup imo), Valencia retrained does OK, Callum Chambers (Fans don't like it at first as he comes from Arsenal), Clyne