Brock Purdy silencing questions about health of his arm yardbarker.com - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from yardbarker.com Daily Mail and Mail on Sunday newspapers.
Trey Lance's hopes of challenging Brock Purdy to be the starting quarterback for the San Francisco 49ers hit a rough patch during Friday's practice. In an…