The 17-year-old shot-stopper, who was part of the USA’s Soccer Development Academy and is also eligible to play for Poland, is joining the Royals’ Academy to train for the rest of the season before putting pen to paper on a two-year deal.
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"We're pleased to have secured Aleksandar,” he told the club’s official website.
“He's one of our 'under-the-radar' deals and a goalkeeper with a lot of raw talent.
"Hopefully, under the tutelage of [goalkeeping coach] Sal Bibbo, Aleksandar will develop into a good player for Reading Football Club."
The Royals are rooted to the bottom of the Premier League table, eight points from safety, and host Liverpool on Saturday as they aim to keep their slim survival hopes alive.