I don't play soccer, but don't see why he couldn't play if he wanted to. I use the stickman PD belt to hold my cath and have not had any issues with it.
I use Patients Pride. You can google them. I think it is more useful for sports. I use it for working out, yoga, etc.
My advice would be to always wear a hernia support, (whether playing sport or not,) and to leave the peritoneal cavity drained while undertaking sporting activities that may cause a strain on the groin area.Henry P