The 'Angel' singer's had recently cracked his rib during a rough boxing match, and now a subsequent knee injury from a football match has left him out of sporting action for up to three months.
Williams had put his heart and soul into organising games for the team named after his favourite team, League One's Port Vale. He had even arranged for celebrity pals, including Declan Donnelly and Jonathan Wilkes, to play in the upcoming US clashes.
But he now bemoans that he will not be able to participate in the matches owing to his injuries.
"I'm beyond depressed. I'm not playing because of my knee. I've been told I'll be out for one to three months," the Mirror quoted him as saying.
"I'm beyond gutted. I'm devastated. And I've got a cracked rib.
Williams further said that was so determined to play again that he even had his physiotherapist flown over from England for a second opinion.
"I had my physio come out from England who was on my tour last year (Close Encounters) and I'm out for one month to three months," he said on the internet.
"I'm beyond depressed. I had three weeks running up to it when I was cycling, running, and playing soccer," he added.