The former Southampton youngster had been a free agent after being released by MK Dons earlier this summer.
The stopper will be hoping to head to the Olympics in Brazil next summer.
The 22-year-old American is looking to kick-start his career with the Championship club after being released by the Saints.
The 22-year-old American is reported to have a number of English suitors after being released by the Saints.
The US Under-23 international's contract expires in the summer and he is keen to get his first taste of senior football.
The ex-Sunderland striker was at FIFA headquarters along with the likes of Southampton's Cody Cropper and Bolton Wanderers defender Tim Ream ahead of Tuesday's friendly against Switzerland.