Ribeiro was substituted after just 30 minutes in the DStv Premiership goalless draw away to Golden Arrows on Wednesday night and there were fears his season could be over with the Nedbank Cup final looming.Mokwena blamed the high number of matches, using assistant referee Zakhele Siwela as an example of the congested schedule.”I’m not sure, let me put this into context a little bit and last game people asked me about the volume of games and you know who pulled the hamstring in the last game, Sundowns’ last game? It was Zakhele Siwela and then count how many games Zakhele Siwela has…