Khan was 471st in the world when invited to play at Wentworth
England's Simon Khan has been called into the field for next week's US Open, thanks to Justin Rose.
Khan's victory in the European Tour's flagship PGA Championship did not earn him a place at Pebble Beach.
He lost in a qualifying play-off at Walton Heath the following day but comes in as first reserve.
Rose, who won the Memorial Tournament in Ohio on Sunday, needed to have won at least one other PGA Tour event in the past year to be given an exemption.
Khan, who will celebrate his 38th birthday the day before the championship, was already planning to travel to California in the hope of somebody pulling out.
He shot 67-70 in the qualifier and was part of a six-man play-off for the final five spots, but missed out when he parred and, amazingly, the other five - Finn Mikko Ilonen, Spaniard Pablo Martin, French pair Gregory Havret and Jean-Francois Lucquin and Swede Rikard Karlberg - all sank birdie putts.
His call-up continues a remarkable turn of events for the man who last November had to return to the Tour qualifying school and who was 471st in the world when he was given an invitation to Wentworth just three days before the start of the PGA Championship.
Khan won the title - plus more than £637,000, a five-year Tour exemption and a place in next month's Open at St Andrews - on his wife Lesley's birthday with a closing 66.
He had started the final round seven behind. It was the biggest last-day comeback in the history of the event.