He wants to play through the pain against Valencia. IMHO we should not play him, because Umtiti is suspended against Getafe, so he could recover and partner Mina in that game.
Against Valencia, I would play Mina. We have been shafted by CB injuries this season already and Vermaelen stepped up to the occasion. Hopefully Mina can do the same. If Valverde fields a defensively solid and positionally aware team in 4-4-2 formation against Valencia, he will do fine and we should be good. Rakitić and Busquets should help him as CB's and if we field Roberto and Semedo at RM and RB, he would be well protected.