Signs in at least two locations at Under Armour's headquarters welcomed Manziel to "the team," though its not clear which team that is, exactly.
Requests for comment from Under Armour were not immediately returned Monday evening.
Manziel, known as "Johnny Football," would be the latest in a long line of high-profile athletes to endorse the Baltimore-based sports apparel giant. Under Armour has latched on to young NFL stars like Cam Newton—who gained notoriety in the playoffs with his UA-branded "SuperCam" cleats—to appear in its promotions.
Meanwhile, the official apparel supplier of the University of Maryland has expanded its line of collegiate affiliates, as well, recently snagging a deal to outfit Notre Dame's athletics department. UA also announced a partnership with the Naval Academy's athletics department this month. The U.S. Winter Olympics teams should also feature select Under Armour apparel next month in Sochi.
Manziel, who appears as frequently in sports pop culture blogs as he does in football awards lists, would bring further exposure to Under Armour.
NFL Draft analysts project the athletic signal-caller to go as early as the top-10 in the spring draft.
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