By Matthew Abbott San Francisco 49ers owner Jed York has confirmed that star quarterback Brock Purdy will be receive a huge contract offer. Purdy, 24, is eligible for a contract extension after this coming season and could be set for one of the biggest pay rises in NFL history. Despite earning only $1.9million (£1.5m) over two years since turning pro, and set to make another $985,000 (£780,000) this season, Purdy’s salary should skyrocket at the end of his rookie deal. Purdy led the 49ers to Super Bowl LVIII in February, where they lost 25-22 to the Kansas City Chiefs in overtime. To put Purdy…