The two Americans were involved in transactions on Mexico's transfer deadline day.
The former U.S. national team left back was loaned by Tigres to Atlante after appearing in just seven matches for the Apertura 2011 champions. Bornstein's move to the Potros could last up to a year.
Bornstein, 27, will join Chilean striker Esteban Paredes and fabled Argentine coach Ricardo La Volpe as Atlante's main additions after failing to make the playoffs in the Clausura 2012.
Elsewhere, Edgar Castillo made his Tijuana loan permanent as the Xolos bought out the former Santos man's contract from Club América, which originally sent the player on a season-long spell to the team that also features Americans Joe Corona and Greg Garza in its first team squad.
Castillo was key to Tijuana's survival in the Mexican Primera and reignited his own stagnant career, solidifying himself as a viable option for Jurgen Klinsmann on the left side of the USA's defense.
Herculez Gomez stayed in Santos despite rumors placing him back in Puebla, the team that originally brought him to Mexico in 2010.
Santos Laguna did, however, place striker Gustavo Ruelas on the transfer list, although there were no takers. He is still eligible to be transferred on Thursday, albeit to a second-division team as per Mexican League rules.
Diego de la Torre, who is eligible to play for both the Mexico and the USA, was loaned from parent club Toluca to Querétaro for the upcoming season.
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