Tickets for friendly match July 27th?

I am going to be in Barcelona later this month. I am hoping to get tickets to the friendly match on July 27th. When I visit the team website it shows the ticket button greyed out. I am not sure why. Are tickets sold out? Have they not gone on sale yet? Are they not open to the public to buy? I understand that I need to have a minimum number of characters in my post so I sure hope this is sufficient for the mods!