The Bantams have received clearance from the Football Association that the deal was completed before the transfer deadline at 23:00 BST last Friday.
The 21-year-old American had a loan spell in League Two with Stevenage last season and made seven appearances as they won promotion.
He could make his debut in Saturday’s home game against Grimsby Town.
Find all the latest football transfers on our dedicated page.
Bradford (Park Avenue) have signed ex-Guiseley midfielder Lewis Hey on dual registration terms with Silsden.
Hey, 19, proved himself to be a prodigious talent coming through the ranks of the Lions’ Academy set up, but the last few years have proved frustrating.
Covid disrupted his 2019-20 and 2020-21 seasons and injury hit his attempts to grab a regular spot in the first team in 2021-22.
Hey made his first-team debut for Guiseley in the 2020-21 season before featuring several times over the following campaign, and also started their FA Cup clash at AFC Wimbledon last season.
He also went out on loan in September 2022, joining Tadcaster Albion, now of the Northern Counties East League Premier Division until October 2022.
Hey made 26 appearances for Guiseley while in National League North,21 of those being in the 2021-22 season.
He also scored two goals in that season, the winner in a 1-0 victor at Chester, and one against Darlington in a 5-1 away defeat.
Hey is available for selection in Avenue’s away game against FC United of Manchester in the Northern Premier League Premier Division today.
Stubbs, a firm contender for man-of-the-match on the day following a strong performance, was substituted in the 85th minute with a thigh problem with Jon Tomkinson coming on for his debut.
Hughes said: “We hope he’s okay. He just tightened up on his thigh, so hopefully it’s not anything significant.
“It’s important to have those leadership roles in the key areas. Obviously Sam’s vocal and will pull people in and push them out.
“When he’s there, he’s a good influence on those in front of him so we’ll keep our fingers crossed on the injury.”
Meanwhile, Hughes confirmed that he expects striker Tyler Smith (groin) to miss this weekend’s home game with Yorkshire rivals Harrogate Town.
The former Hull City and Sheffield United attacker missed the weekend draw with the Mariners.
